Random server identity, DNS

[Hagforce]

Hello

I use ISPConfig to host a few domains.
Everything has been running smooth and stable now, so it`s great.

One thing I noticed the other day though.
When getting e-mails from the server it seems to identify randomly.
Sometimes avg antivir on my win pc says getting mail from domain1.com, the next time it might say getting mail from domain2.com and so on.
Even if my e-mail account is only on domain3.com

Hope I made some sense her.

What have I missconfigured?

[till]

Do you have more then one IP address? Then you should bind postfix to one specific IP address by adding the following line to your main.cf file:

smtp_bind_address = 123.123.123.123