==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.3.2
- Deployed with iRedMail Easy or the downloadable installer? Installer
- Linux/BSD distribution name and version: Debian 10.8
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- 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.
====

Hi there.

I have successfully installed the entire iRedMail package in our company, everything works almost perfect.! Just a detail that I am going to tell and thus be able to find a solution.

The server was installed in a proxmox container, locally you can send and receive emails from the roundcube, also from outside the company (example: my home), we have no problem establishing users and/or their passwords from ldap or iredadmin , roundcube works fine locally or from any pc.

The problem lies in outlook and thunderbird or any other mail client. I have already read all the documentation and the messages here in the forum for a solution.

The connections from mail clients when we make them locally work correctly, if these connections are made from mail clients outside the company they do not work, and I have already tried all the configurations. The host does not recognize the user does not accept the connection when sending an email.

I hope you have explained me and let me know if I should give any more information to obtain a solution.

Greetings