==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.3.2
- Deployed with iRedMail Easy or the downloadable installer?downloadable installer
- Linux/BSD distribution name and version: Debian 10
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? Yes
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Hi all,

the past weeks i noticed on the postfix section of logwatch that the "Connection lost (inbound)" number has increased a lot.
Example:
    2264   Connections                                  2,264
     662   Connections lost (inbound)                     662

I check past logs and the past few weeks the lost connection rate is about 25%.

Is this normal?

If not, can it be caused by an iredmail configuration?

My two other observations are:
a) I see no network problems with the server.
b) Lately, we had lots of email, where some recipient's domain names were unresolvable by our dns servers.