==== Required information ====
- iRedMail version (check /etc/iredmail-release):
- Linux/BSD distribution name and version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):
- Web server (Apache or Nginx):
- Manage mail accounts with iRedAdmin-Pro?
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
========
- iRedMail version (check /etc/iredmail-release): 0.9.7 MYSQL edition.
- Linux/BSD distribution name and version: ubuntu-xenial-16.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx):Nginx
- Manage mail accounts with iRedAdmin-Pro? no
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Hello, have created a server on AWS and Roundcube works fine, as does IRedAdmin.

Unless I'm mistaken, nmap shows that the necessary ports are open and listening :
PORT      STATE SERVICE
22/tcp    open  ssh
25/tcp    open  smtp
80/tcp    open  http
110/tcp   open  pop3
143/tcp   open  imap
443/tcp   open  https
587/tcp   open  submission
993/tcp   open  imaps
995/tcp   open  pop3s
3306/tcp  open  mysql

When I try to configure either Thunderbird or Outlook, I got the following error.
my server is mail.domain1.net
the user and domain are on domain2.net

My configuration is :
imap.domain1.net    143   STARTTLS   normal password
smtp.domain1.net    587   STARTTLS  normal password

Login is complete mail address.

I've tried with imap@domain1.net, imap@domain2.net, same with smtp. Again I can connect this user, on this domain, with Roundcube, but no success with Tbird nor Outlook.

tail -f mail.log  does not give anything related to the errors
cat /etc/hosts.deny | grep myip is clear
grep -r "myip".  while being in /var/log only shows successful access to RoundCube and IRedAdmin.

I'm admittedly a bit lost. If anyone can give me pointers, it will be much apppreciated.

Best regards

Sollips