Hallo,
Wir mappen per virtual_alias_maps eine neue Domain auf die alte Domain um:
@neuedomain @altedomain
wobei du dabei auch aufpassen musst, da so alle E-Mails für alle Empfänger in neuedomain angenommen werden, auch wenn diese in altedomain gar nicht existieren:
Note: @domain is a wild-card. With this form, the Postfix SMTP server accepts mail for any recipient in domain, regardless of whether that recipient exists. This may turn your mail system into a backscatter source: Postfix first accepts mail for non-existent recipients and then tries to return that mail as "undeliverable" to the often forged sender address.
s. http://www.postfix.org/virtual.5.html
Gruß Christian