SMTP Banner wrong - eMail Server Setup Problem

[itratosTeam]

Hello emersion,

Thanks for this solution
I have a question about using it as an email server

IMAP and SMTP GO is installed on Ubuntu
We have set up iptables with port forwarding
25 >> 1025
143 >> 1143

when we send an e-mail we get the message that the smtp banner is wrong, or the domain we are sending from is not authorized
If we use telnet to check the domain and port 25, then we get the domain of the host server.

telnet domain.de 25
Trying 138.xxx.xxx.xxx...
Connected to domain.de.
Escape character is '^]'.
220 hostdomain.net ESMTP ready

the hostdomain.net is the revers dns domain from the server and i have check this is right.
i have create a PTR record with hostdomain.net and the server ip in the domain dns from domain.de

i have check with mxtoolbox, all setting the domain.de, all is fine and green ;-)

When I send an email I get the message that the domain I am sending from is not authorized, because the hostdomain.net is transferred in the SMTP banner as sender and not domain.de

if you explain to us how to install the software as an email server, then I will be happy to pay your effort. The instructions are sure to be beneficial for everyone here.
Greetings Timo