Problem with email domains...
 

Hi, I have realized now that I have a problem with email domains. Every email I send, even if there are from different domains are sent with the same domain.
For example:
user@somedomain.com
and
user2@anotherdomain.com

Are both sent as
@somedomain.com

What do I have to do?

I think I have configured DNS MX for both domains, but still there are sent only by @somedomain.com
Dont know what to do now...

You must set the sender address in your email client or webmail software.

So for example if I had some clients, I would have to tell them they have to configure squirrelmail to their domain name? Thanks Falko.

Yes, you must always set your own email address in an email client or in webmail.