Depending on how your Debian system was set up, an email server like exim, Postfix or Qmail may already be installed on your host. 71) which I use as a smarthost to my ISP (verizon). However with >>> it set to 465, it stays in the mailq. net (Exim) litens on port 25 (smtp) and 465 (smtps). broadband. 0 needs to be disabled for pci compliance and I am also failing due to not being able to disable it. The log for an unsuccessful mail says: Exim Smart Host¶ How to properly send out email messages on a server when having an external mail server to your local area network. tell exim to smarthost/manual route that dest domain to that local IP/port May 12, 2018 · 1. Additionally, I don't see the need for hosts_require_auth. myprovider. But that says nothing about the failure reason. mouseware. 1 Connected to localhost. It transfers emails from mail server to mail server until they reach their final destination. secure-email-32. net which is also good but attempts to communicate with that host now end instantly as in the following from /var/log/exim4/mainlog Sep 6, 2019 · Exim MTA is running on ports 25, 465, 587. However Thunderbird is able to send e-mail from workstations to the same server using port 465 and have SSL/TLS identified as the connection security. So it's the From there, click on the Advanced Editor tab and then search for "tls_on_connect_ports". Configurar Exim4 para que divida la configuración en pequeños ficheros. If Mar 16, 2015 · >>> If dc_smarthost has the port set to 26, mail gets sent. Jan 4, 2013 · For many years I have used exim to run both an MX and a Submission service. It's the Exim4 (encrypted Feb 26, 2006 · > I would like to configure Exim to send all of my non-local outgoing mail > through an external relay on port 465. Exim >supports tls_on_connect as a server only, but not as a client. - Marc To configure saslauthd to provide authentication for Exim4, first install the sasl2-bin package by running this command at a terminal prompt: sudo apt install sasl2-bin. Make sure you're using the big config file option with dpkg-reconfigure exim4-config. Lynis probably needs to be improved a bit regarding this. 68 TLSv1. On Sun, Jan 24, 2021 at 02:10:16PM -0500, Harry Putnam wrote: > When editing a smarthost line in udpate-exim4. l. another mail server. Basically, configuration is generated by update-exim4. tell exim to smarthost/manual route that dest domain to that local IP/port The exim FAQ has pointers on how to setup manual route to a specific destination (though it looks like smarthosting is what you're looking for), as well as how to use a different dest port # (other than 25). Chances are you're not even using that transport. conf says two colons are needed here. daemon_smtp_ports = 25 : 465 : 587 tls_on_connect_ports = 465 tls_certificate = /path/exim. 77, you can set the SMTP driver's protocol option to "smtps" for SSL-on-connect, which should let you remove stunnel from the Jan 7, 2019 · My e-mail smarthost uses 587 for unencrypted >>> connections but 465 for encrypted. Jun 19, 2017 · SMTPLISTENEROPTIONS='-oX 25:465:587:10025 -oP /run/exim4/exim. Googling my Nov 21, 2005 · >> exim4 debian user's list and we'll see if I get any hits in case >> it matters though, I tried your command and received the following >> but no message delivered. It's the Exim4 (encrypted Mar 14, 2015 · Also, port 465 is SSL on connect, you probably need to tell exim that. rogers. Does this confirm that my host is using ssl-on-connect? (NB Jan 7, 2019 · My e-mail smarthost uses 587 for unencrypted >>> connections but 465 for encrypted. From there, additional ports may be added as necessary by appending a semicolon and then the port number like so: tls_on_connect_ports = 465:587. com SMTP server as your smarthost. It's the Exim4 (encrypted Jun 13, 2018 · I have restored my system's sendmail -t functionality:. conf to set the smarthost set as Feb 27, 2024 · Install Exim Ubuntu/Debian. office365. To install Exim on Ubuntu and Debian servers, ensure your server is fully updated. x - Mail Setup. extremeground. variables. You may want to try using port 465 (SSMTP). TLS 1. com:465 Then reconfigure exim4: dpkg-reconfigure exim4-config Configure exim4 to use a lot of small files, smarthost through localhost:587. The basic idea is to change the /etc/exim4/update-exim4. Next, to make Exim4 use the saslauthd service, the Debian-exim user needs to be - Internet host with no recognized or dns resolvable name, or domain - Receives dhcp address, but made mostly permanent by router capabilities When editing a smarthost line in udpate-exim4. com :secret123) After starting exim with the configuration described above, I get the following two Mar 16, 2015 · >>> If dc_smarthost has the port set to 26, mail gets sent. In addition to the features already supported by exim4-daemon-light, for advanced features such as LDAP, sqlite, PostgreSQL and MySQL data lookups, SASL and SPA SMTP authentication, embedded Perl interpreter, and the content scanning extension (formerly known as "exiscan Debian uses Exim4 as a mail server by default. The relay host requires TLS and > SMTP authentication. If Chapter 42 - Encrypted SMTP connections using TLS/SSL. mail. Sending, receiving and DKIM signing also wor Jan 6, 2019 · > On 05/01/2019 23:34, Gary Dale via Exim-users wrote: >> Without ss/tls, my server is mail. 444 Connected to smtp. It's the Exim4 (encrypted) configuration I need help >> with. However, the hosts_avoid_tls option may override that setting. I therefore updated update-exim4. Not necessary. 333. autogenerated file generation code is happy and produces a conf. I searched using Google and the mailing list archives for about an hour now but found no solution. Configuration of exim4 on Ubuntu is similar. setup stunnel to listen on a local IP:465, with the remote end of the tunnel being your smarthost at the ISP, or whatever destination needs ssl on port 465 . I can send e-mail this way but in order to use ssl/tls, my smtp server is in the r4l. com Jul 20, 2018 · First of all you have to enable SMTP encryption with SSL/TLS. However, I think I see the problem, :25 >> I'm pretty sure I need to be coming in over 465 with SSL trying to >> find in the docs how to set this now > Sep 10, 2006 · exim4: doesn't support outgoing SSL connections on port 465 Package: exim4 ; Maintainer for exim4 is Exim4 Maintainers <pkg-exim4-maintainers@lists. The example should establish its own remote_smtp_smarthost_smtp_over_ssl router. > > The single colon is a typo Jul 18, 2022 · I also added localhost:my-email:my-password to my /etc/exim4/passwd. But when I tried to send mail using echo "<Mail Body" | mail -s "<Subject>" [email protected] the mail is not sent. 1. default is sufficient for a host with simple mail requirements. A smarthost can be an external smtpd server provided by SendGrid, AWS, Rackspace, Google apps/Gmail, ISP or your own server in another data center. Jan 6, 2019 · > On 06/01/2019 19:34, Gary Dale via Exim-users wrote: >> You've missed the point. Auf unverschlüsselte Anfragen reagiert der SMTP aber nicht. co. exim4_files (5)) we configured exim to use exchange. In a different window, send an email from your system and make sure that you see a record go by withR=smarthost T=remote_smtp_smarthost H=gmail-smtp-msa. # # see exim4_passwd_client (5) for more documentation # # Example: ### target. com (111. . 2 192 Client Key Exchange, Change Cipher erwartet an Port 465 eine ssl-Verbindung, die baut exim aber anscheinend nicht auf. 168. debian. This should be set using the command dpkg-reconfigure exim4-config. Jan 5, 2013 · For many years I have used exim to run both an MX and a Submission service. Crear un fichero para definir las variables globales a usar con Exim4. The workaround is to get Exim to listen on another port other than 25 to bypass the ISP's block. com:465 to use that port instead of 25. These instructions will help set up an email server as a smart host. conf to set the smarthost set as Jan 5, 2019 · successfully work with without ssl/tls but when I try to use ssl/tls, it fails. Then, install Exim in Ubuntu/Debian using the commands below. > I have a stock Debian (6) with Exim4 (4. server May 18, 2023 · Your message dated Mon, 11 Sep 2006 10:44:33 +0200 with message-id <20060911084433. You're using Exim as a client here. com:587 as a smarthost. The port can now natively handled in debconf by specifying 127. com offers STARTTLS extension of ESMTP protocol => your MTA/exim can turn unencrypted SMTP connection into encrypted one (the same TCP connection). ) I did add tls_on_connect_ports = 465 to exim4. If the user connects with TLS or SSL on 587 or 465 and authenticates then we put exim into submission mode and will relay mail to anywhere for them. com, listing that DNS name in passwd. Now you need to configure exim to use this to firstly authenticate, then send the email onto the smarthost. To configure saslauthd, edit the /etc/default/saslauthd configuration file and set: START=yes. Use the following access table entry: TLS_Srv:mail. If you need more advanced features like LDAP, sqlite, PostgreSQL and MySQL data lookups, SASL and SPA SMTP authentication, embedded Perl interpreter, and exiscan-acl for integration of virus-scanners and SpamAssassin, you can replace exim4 Nov 21, 2005 · R=smarthost >> T=remote_\ >> smtp_smarthost: retry time not reached for any host after a long failure >> period >> > > Your smarthosted is blocked in your retry database because the maximum > retry time is reached. GA13631@nechayev. conf. conf file is (replacing <remote host name> with the actual name). Apr 8, 2015 · Using update-exim4. , mail client to mail server) while SMTP (Port 25) is the protocol, or set of rules for formatting data, that helps emails travel across the Internet. de> and subject line Bug#386875: exim4: doesn't support outgoing SSL connections on port 465 has caused the attached Bug report to be marked as done. As an introduction to the way Exim is configured, this chapter “walks through” the default configuration, giving brief explanations of the settings. telnet smtp. Jun 4, 2024 · Some ISPs are now blocking outgoing port 25 which prevents users from using SMTP via their server. Apr 5, 2016 · GMail offers multiple MXs with different behaviors—aspmx. Establecer los puertos de escucha, 587 y 465 para que se entregue el correo saliente. For example, to get Exim to listen on** both port 25 and port 587**, you'd add the following code to /etc/exim. The text in question has been change to: Nov 21, 2005 · R=smarthost >> T=remote_\ >> smtp_smarthost: retry time not reached for any host after a long failure >> period >> > > Your smarthosted is blocked in your retry database because the maximum > retry time is reached. STARTTLS turns unencrypted connection in encrypted one. This script is reading files in /etc/exim4 to generate configuration in /var/lib/exim4. Same for outgoing mails as well. Nov 24, 2015 · On Debian and Ubuntu, Exim 4 is configured most easily using a template system. $ sudo nano /etc/exim4/passwd. Apr 28, 2013 · 1) your exim sends outgoing email via smart host. It offers STARTTLS on port 25. Using Thunderbird with ssl/tls on >> port 465 works. Jun 26, 2023 · Try to smart host via port 587 (msa/submission) instead of 465 (smtps). Refer to Exim's documention regarding their default configuration for additional information. However with it set to 465, it stays in the mailq. Trying ::1 Trying 127. Aug 17, 2020 · According to my default exim configuration, to send e-mails over SSL connection I need to use port 465, while to send e-mails with no SSL, I have to use port 587. With exim4, things grind and grind with incrypted traffic going back and forth only to see a clear message: 208. I can send >> e-mail this way but in order to use ssl/tls, my smtp server is in the >> r4l. 180. 2 192 Client Key Exchange, Change Cipher the SSL through stunnel (localhost:26 -> isp:465) works but the gmail As of Exim 4. I do not need to use TLS for incoming mail. f. Establecer el nombre de correo: /etc/mailname. pid' Afterward you have to restart exim: /etc/init. suddenly I not be able to use TLS however the SSL certificates is verified. com作为smarthost来实现的。鲜见以其他smtp服务器作为smarthost的，有几篇也是错误的，除了误导人外别无他用。 Nov 21, 2005 · >> exim4 debian user's list and we'll see if I get any hits in case >> it matters though, I tried your command and received the following >> but no message delivered. Smarthost. client, not the target addresses (otherwise you'd need the whole world in that file). 2) the smart host refuses to relay (accept to send send further) without SMTP AUTH. key Self-signed pair generated by openssl is enough. net ENCR:128. Search for (Ctrl+w): . Encryption is an option for the plain SMTP on the port 25 or MSA on 587 and mandatory for SMTPS on 465. You can fix this by adding a hosts_require_tls option with the smarthost in the list to your configuration. conf and sudo systemctl restart exim4 now runs successfully. net. The source depends on whether you've selected to split up configuration or not when running dpkg-reconfigure exim4-config. If dc_smarthost has the port set to 26, mail gets sent. 68 â 192. template A. > In thunderbird config, you more-likely want STARTTLS than SSL/TLS for > the outbound smtp server settings. com domain and uses port 465. > > The single colon is a typo Apr 6, 2005 · On Tue, 5 Apr 2005, Kiesel wrote: > > Has anybody got a clue how to configure Exim to use SSL (not TLS!) for > *outgoing* mails on port 465 to some smarthost? Symptoms When you run the following command for your DOMAIN and also ports 443, 465 and 993 separately: read -p "Domain && Apr 6, 2005 · On Tue, 5 Apr 2005, Kiesel wrote: > > Has anybody got a clue how to configure Exim to use SSL (not TLS!) for > *outgoing* mails on port 465 to some smarthost? Nov 21, 2005 · R=smarthost >> T=remote_\ >> smtp_smarthost: retry time not reached for any host after a long failure >> period >> > > Your smarthosted is blocked in your retry database because the maximum > retry time is reached. @zEitEr: I think funken is saying he needs to use a public service to relay his mail. Exim generally comes with default Debian installation. google. Chapter 39 - Encrypted SMTP connections using TLS/SSL. Nov 21, 2005 · which Outlook and Thunderbird refer to as "SSL", is a non-standard hack invented by Microsoft and traditionally served on port 465. client may not actually be sufficient there's some reverse DNS lookup involved in the process. com on 25, 465, and 587 which doesn't seem to enforce TLS/SSL but requires Jan 7, 2019 · My e-mail smarthost uses 587 for unencrypted >>> connections but 465 for encrypted. org> ; Source for exim4 is src:exim4 ( PTS , buildd , popcon ). localmacros, which is > supposed to cover the SSL on connect issue. 1::465 as smarthost (see man update-exim4. You can configure this Exim4 to use the Google's SMTP servers as its smarthost using your Gmail account. 2 617 Certificate, Server Key Exchange, Server Hello Done. conf How does one enter a server that requires ssl 465. Port 587,This is the default mail submission port, so it should only be used for submissions (i. All groups and messages Nov 24, 2005 · >which Outlook and Thunderbird refer to as "SSL", is a non-standard hack >invented by Microsoft and traditionally served on port 465. Dec 3, 2011 · Ak váš smarthost neposkytuje STARTTLS, máte smolu, pretože Exim4 odmietne odoslať prihlasovacie údaje otvorene, teda v nešifrovanej forme. domain. Exim 4. 0. Hi. I used Tony Finch's University of Cambridge documentation as a guide but, briefly, I run exim on port 25, 587 and 465. Schultze-- Schlagfertigkeit ist das, was einem auf dem Heimweg einfällt. conf (8) (c. conf). com:25 which will allow dynamic IPs and will deliver only to GMail users, but does not require authentication; smtp. The following configuration sets up Exim to send via a Smarthost, i. Besides the dc_smarthost addition "::465", I added protocol = smtps in the "transport/30_exim4-config_remote_smtp_smarthost" section and didn't change "tls_on_connect_ports". If this process is not done, email most likely will not be received as it would be invalid and/or blocked by spam filtering. uk seems to offer SMTP AUTH over connections to port 587 after STARTTLS (turning on encryption) It can be tested with tools like telnet-ssl provided on linux exim4通过sma. If Jun 12, 2024 · How do I configure an Ubuntu server and postfix as the relay server (smarthost)? You can configuring Postfix MTA to use as a Smarthost i. e. suddenlink. Oct 17, 2005 · To: exim-users Betreff: Re: [exim] smarthost with ssl/tls over 465 and smtp-auth Jan 23, 2013 · client=yes [smtp-gmail] accept = 587 connect = smtp. zugschlus. ionos. It's the Exim4 (encrypted Gary Dale wrote on 03/14/2015 06:00: <snip> > > I did add tls_on_connect_ports = 465 to exim4. Let's assume: You are ok with Gmail rewriting your sender address or use this Gmail address. Apr 6, 2005 · Suche nach Nachrichten innerhalb dieses Threads, die folgende Schlüsselwöer beinthalten: May 31, 2018 · When I leave that out, the conf. conf Exim Overview. localmacros, which is supposed to cover the SSL on connect issue. com:587 (or 465) which requires TLS/SSL and also allows dynamic IPs, but requires authentication; and finally smtp-relay. The default configuration file supplied with Exim as src/configure. fr::465' Make changes to /etc/exim4/passwd. apt update && apt upgrade -y apt install exim4. Installation. That looks good but then there's more encrypted fog and then: 208. 04. uk 587 gets SMTP greeting message. 网上关于解决此类问题的资料很多，但几乎都是以smtp. Feb 26, 2006 · Exim does not > support SSL-on connect as client, you'd need to plug-in stunnel in > between. Afterward you can check the connection: Apr 13, 2023 · In addition to that, as you have configured your server to use Gmail as a "smarthost", sending mail through the "authenticated mail submission" port 465/587 (instead of the usual "servre-to-server mail exchange" port 25), it means Gmail doesn't consider your messages to be mail from an external site – they are treated as messages from your Gmail account back to yourself. Studying the section for /etc/exim4/passwd. Jan 7, 2019 · My e-mail smarthost uses 587 for unencrypted >>> connections but 465 for encrypted. Exim supports tls_on_connect as a server only, but not as a client. This means that you claim that the problem has been dealt with. conf file and then run the template generation over it. 444). Well, when I configure the e-mail sender to use SSL and I use port 587, it fails sending, but if I use port 465, it sends the e-mail correctly, which is the expected behaviour I did add tls_on_connect_ports = 465 to exim4. Mar 13, 2015 · However Thunderbird is able to send e-mail from workstations to the same server using port 465 and have SSL/TLS identified as the connection security. (previously they were using STARTTLS on port 587 which worked just fine) I am getting infinite deferrals and connection timeouts. When I telnet to my remote host on port 465, I just get the following, and nothing more Trying 111. Aug 7, 2019 · Not sure if it makes a difference or not; but my exim satellite configs have this entry (dc_other_hostnames) set to the local system's name. crt tls_privatekey = /path/exim. In passwd. This is found in /etc/exim4. [] > dc_smarthost='mail. > Apr 5, 2005 · Has anybody got a clue how to configure Exim to use SSL (not TLS!) for *outgoing* mails on port 465 to some smarthost? I don't want to use TLS on port 25 as this port is blocked by my ISP. It's best to use exim -bP without parameters, that shows the main settings. Regards Nov 24, 2005 · >which Outlook and Thunderbird refer to as "SSL", is a non-standard hack >invented by Microsoft and traditionally served on port 465. Edit /etc/exim4/passwd. 1. Set the Fastmail server as the smarthost. ∆ These instructions will guide you through configuring Exim to use SMTP. So it's the Dec 19, 2017 · Configure exim as satellite ( mail sent by smarhost; no local domain) Set the smarthost hostname [::port] (for example smtp. > Mar 14, 2019 · When running exim -bP transport remote_smtp_smarthost, only the settings for the remote_smtp_smarthost transport are shown. I have Exim4-heavy, GunTLS. I'm frankly not going to take the time to figure out how to set it up for a commercial relay service using password authentication, because there's never in almost ten years been any demand for it, and it would be a learning curve for me. There is no cryptographic code in the Exim distribution itself for implementing Just apting the metapackage exim4 will pull in the other packages per dependency. tls_on_connect_ports = 465 to your exim configuration file so that the SSL session is immediately started when connecting to port 465. mail. Your account name on your local Debian box: YOUR-USER-NAME. Try > running "exim -v -M 1EeF4R-0007Bz-Nt" to force retrying. client in man exim4_passwd_client led me to realize that just because my outgoing mail is sent via smtp. autogenerated that indicates we are using port 465 which is true and that the smarthost is smtp. However, I think I see the problem, :25 >> I'm pretty sure I need to be coming in over 465 with SSL trying to >> find in the docs how to set this now > Mar 13, 2015 · Conversations. uk seems to service port 587. client and add: localhost:[email protected]:yourpassword Remember to check permissions, and then run: update-exim4. This guide will take you through your Mail Setup with step-by-step instructions. ifdef DCconfig_smarthost DCconfig_satellite Add this at the beginning of the settings, after this line '# here so that mail to relay_domains is handled separately': send_via_gmail: driver = manualroute domains = ! +local_domains Hello, someone can tell me how to configure exim to send email with my gmail account ? thanks ! (smtp. com::587'. The text in question has been change to: Instalar el paquete exim4-daemon-heavy. # password file used when the local exim is authenticating to a remote # host as a client. Using Thunderbird with ssl/tls on >>> port 465 works. I would recommend to not disable TLSv1. alioth. Jul 4, 2016 · 2. when I telnet to port 465 it gives. Oct 20, 2020 · Managing Exim4 TLS in Ubuntu 20. conf file. client and run sudo update-exim4. com::587) If you need to configure exim by editing the config file (instead of using dpkg-reconfigure), these are the related values: dc_eximconfig_configtype='satellite' dc_smarthost='smtp. Jul 22, 2017 · After a week of installing and configuring my first Linux (mail)server (Debian 9, Exim 4, Dovecot) the TLS encrypted communication with my client works. it was configured correctly and the mails was working fine. They are switching to SSL on port 465 and I am having a hard time getting exim4 to cooperate. You force sendmail to always use STARTTLS on SMTP connections to mail. smtp/SSL port (465). Append :465 to the name, ie smtp. You'll get an exim daemon with minimal feature set (no external lookups). > >You should file a debian bug to have that documentation clarified. The text in question has been change to: Apr 5, 2005 · Has anybody got a clue how to configure Exim to use SSL (not TLS!) for *outgoing* mails on port 465 to some smarthost? I don't want to use TLS on port 25 as this port is blocked by my ISP. (Or convince the remote server administrators do move to STARTTLS on port 587. custom file: With exim4, things grind and grind with incrypted traffic going back and forth only to see a clear message: 208. Jul 10, 2022 · I have setup my exim4 as a local mta with smarthost delivery (debian 10 vm) following this guide: Exim on DebianWiki If my smarthost is expecting a ssl connection (smtp over ssl) it does not work. 0 since you will definitely lose some incoming mails from older mail servers that do not currently support TLS > v1. com as an authenticated remote SMTP transport for all your non Here is a guide for setting up exim4 email server in send-only mode on Debian 10 Linux. Use the app password you set in Step 1. My update-exim4. myrelay. Set the rogers. There is no cryptographic code in the Exim distribution itself for implementing TLS. @funken: I'm the guy who wrote the exim. Jan 5, 2019 · successfully work with without ssl/tls but when I try to use ssl/tls, it fails. Put that server's name in your passwd. Exim is a message transfer agent (MTA). >>> >>> dc_eximconfig_configtype='smarthost' >>> dc_smarthost='<remote host name>:465' >> >> Man update-exim4. 20. Jun 22, 2007 · If you telnet localhost 465 and see a normal SMTP connection, which is running over SSL, you have things working correctly. gmail. Support for TLS (Transport Layer Security), formerly known as SSL (Secure Sockets Layer), is implemented by making use of the OpenSSL library or the GnuTLS library (Exim requires GnuTLS release 1. If you are still struggling to get your setup working, please contact The SMTP Support Team for help. com:587. # telnet localhost 465. Activar cifrado SSL/TLS. com: stagingserver@activedirectory. > I am confused as to whether I need to set up a private key and certificate > to send outgoing mail [] Usually, neither of these. client. contoso. You should file a debian bug to have that documentation clarified. This will cause Exim to send the STARTTLS command to establish a TLS connection. 64 TLSv1. Detailed descriptions of the options are given in subsequent Nov 21, 2005 · Look at the exim FAQ and the stunnel site - you'll want to do something like: . Without ss/tls, my server is mail. > Besides the dc_smarthost addition "::465", I added protocol = smtps in the "transport/30_exim4-config_remote_smtp_smarthost" section and didn't change "tls_on_connect_ports". client ( exim4_files (5)) I have added the following line: exchange. com (use authentication) Use Authentication: Yes . d/exim4 restart When using port 465 you also have to add. My e-mail smarthost uses 587 for unencrypted >> connections but 465 for encrypted. 0 or later). smtp. > Oh, right. 222. 10. Your Exim (by default) should use port 25. 40. luxsci. Práve toto mi v posledných dňoch spôsobilo trochu vrások, pretože nové pripojenie k internetu, ktoré do škôl za štátne peniaze zavádza T-Com, vstupuje do SMTP komunikácie a STARTTLS blokuje. Dec 21, 2022 · 1. Now to enter the settings for your gmail account: pico /etc/exim4/exim4. Escape character is '^]'. >> Also check /var/log/exim4/mainlog for problems. 2020 12:16 by Thomas Urban. If Exim4 restarted, go ahead and run sudo tail -f /var/log/exim4/mainlog to watch the mail logs. conf > How does one enter a server that requires ssl 465. routing all mails to a smarthost. You can test if you already have exim4 on your system: systemctl status exim4 ISP, or whatever destination needs ssl on port 465. smtps seems to be mostly an incoming thing :-(. xc ss xy ub pj qm ap mi zj sz