==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 0.9.7
- Linux/BSD distribution name and version: Ubuntu 16.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx): Apache
- Manage mail accounts with iRedAdmin-Pro? No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Hello, iRedMail experts.

I have a big puzzle that I can’t crack without you.  I am running iRedMail server and I can receive and send email from

1.    Thunderbird
2.    MS Outlook

I also have Gmail and Outlook.com accounts which are connected as aliases so I can send email from Gmail and Outlook as an iRedMail user account.

All of them (Outlook, Thunderbird and webmail clients) connect to my mail server on port 587/TLS.  So, because everything works I can deduce that there is no problem with the firewall and port 587 is open and it accepts connections.  Mail flows.

Now, my problem is that I want to use my mail server as the MTA on my Mautic instance and I can’t set it up – I use the same credentials as in all my clients – host name, user name, password, encryption settings and TCP port.  Mautic can’t connect and throws an error:

Connection could not be established with host mail.mymaildomain.com [Connection timed out #110] Log data: ++ Starting Swift_SmtpTransport !! Connection could not be established with host mail.mymaildomain.com [Connection timed out #110] (code: 0)
++ Starting Swift_SmtpTransport !! Connection could not be established with host mail.mymaildomain.com [Connection timed out #110] (code: 0)

It is easy to guess that there is some problem with Mautic code, however I can perfectly connect Mautic the same way to Mailgun on port 587 and mail works fine.

My question – what else can I tinker in iRedMail to solve this problem?

Thanks in advance