ISPCONFIG and mail appearance problem

[pirinas1980]

A little problem with ispconfig and mails appearance
I have for example the domain : www.mylab.gr
My server hostname is : host.steno.gr
In the domain www.mylab.gr I have setting up the mail account info@mylab.gr with username web46_info and password ###### and real name : Giannikos George.

When I send a mail to someone my mail address appeared like this : web46_info@host.steno.gr and not as info@mylabs.gr

Know anyone how can I fix this?
Thank you very much.

[falko]

You can set the sender address in your email client or webmail program.