Customer just doesn't want his staff to connect to server at port 25. So, we will need to block port 25 from his staff. I can keep Postfix use port 25, but is there any restriction from Postfix can...

Customer doesn't want to enable port 25 completely. So, I am trying to find out a method to replace port 25 by another port.

Thanks.

No, the messages didn't reach to Zimbra server. They were queued on yahoo, google mail servers, and after I switched back to port 25, all messages were delivered after few minutes.

Please pay...

Here are what I have done

1. use zimbraSmtpPort changes port to 2525

2. edit master.cf, change
smtp inet n - n - - smtpd
to
2525 inet n - n - - smtpd

3. close port 25, open port 2525 on...

Can any one explain what this error means please?

It's not working. Error appears right after changing the port

I want to disable port 25 on my server, but doing that will prevent sending out emails from webmail. Is there any way to work around?

Thank you.