an...@ursc.gov.in:
> Hi,
>
> We have migrated to a new domain yyy.com. We also continue to receive
> mails on old domain xxx.com.
>
> When a sender sends a mail to a...@xxx.com (old domain), mail is
> received and delivered to user abcd. Abcd when he replies to all (his
> from email address will be a...@yyy.com [new domain], and hence, mail
> is also sent to a...@xxx.com [old domain]. So, the sent mail is also
> received back to the same sender.
>
> When the actual recipient receives the mail, he will have a...@xxx.com
> and a...@yyy.com in the address list. So, when he replies to that
> mail, 2 mails will be sent to the same user.
>
> What's the best way that, the user receives only one mail, when both
> domains are in To addresses?
/etc/postfix/main.cf:
virtual_alias_maps =
hash:/etc/postfix/old-to-new ...other existing maps...
/etc/postfix/old-to-new:
abcd@old.example abcd@new.example
# postmap /etc/postfix/old-to-new
# postfix reload
Instead of hash, you can use any supported type.
Wietse
