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Topic: Connection time out and refusual to iredmail server

==== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.7 MYSQL edition
- Linux/BSD distribution name and version: ubuntu 14.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): mysql
- Web server (Apache or Nginx):Nginx
- Manage mail accounts with iRedAdmin-Pro?iRedAdmin-Pro-SQL-2.8.0
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====
Good Morning Zhang;
We are having mailing lists server using mailman and postfix and mail is relayed to iredmail server over port 25. Of late we are having problems with mail delays of over four hours
from the mailman server to mail host.The error in the logs of the mailman server is shown as below.

postfix/error: C145C202FDA: to=<mklpot@xxx.xxx.xx.xx>, relay=none, delay=13323, delays=13303/2.5/0/17, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to iredmail server on port 25: Connection refused).

Is there any way of going over this error  and how can connection performance to the  iredmail server be improved from the mailman server.
Thanx
Moses

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Spider Email Archiver: On-Premises, lightweight email archiving software developed by iRedMail team. Supports Amazon S3 compatible storage and custom branding.

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Re: Connection time out and refusual to iredmail server

Port 25 is postscreen service (then smtpd service if client passed postscreen), maybe better for you to create a new smtp port (e.g. port 2525) for mailman?

But back to the error message, "connection refused", is port 25 open (to your mailman server) in firewall?