We are going to do migration some people to Zimbra. There are other people on the old e-mail server.
All people of new email server (Zimbra) must send emails to the old email server (Sendmail).
There is Zimbra at the new_server.domain.com and there is Sendmail at the old_server.domain.com.
There are these servers on the domain.com (MX).
Where can we write rules in the Zimbra's configs, so that people of Zimbra can send emails to people of old_server.domain.com?
Exemple:
user1@domain.com ->
user1@old_server.domain.com user2@domain.com ->
user2@old_server.domain.com
I know, that postfix have a virtual_alias_maps, but this virtual_alias_maps was used 'virtual_mailbox_domains = proxy:ldap:/opt/zimbra/conf/ldap-vmd.cf'.