==== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.2
- Linux/BSD distribution name and version: centos
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx):Nginx
- Manage mail accounts with iRedAdmin-Pro? No
- Related log if you're reporting an issue:
====

Hi My pop3 is : SSL 995 and Smtp : SSL 587, it works well. But after I sending some emails. It stops to send emails or receive emails. Roundcube webmail failed to open too.

What problem of it ?

Many thanks!