Greetings fine postfix wizards,
We are in the process of transitioning from a local postfix and dovecot
infrastructure to using gmail. While we're in the process of copying
over all of our users' archived email to the new gmail environment, we'd
like to have all email delivered both to gmail and to our local dovecot
mailboxes.
simons-rock.edu MX records currently point to Gmail servers. With Gmail
"dual delivery" routing, all email received by Gmail for simons-rock.edu
is delivered to a Gmail mailbox and additionally routed to our internal
email spam filters (hormel.simons-rock.edu) and then on to our internal
Postfix + Dovecot system (hedwig.simons-rock.edu).
However, email that is generated by our users or systems directly via
SMTP to hedwig.simons-rock.edu currently has no way to reach Gmail
mailboxes.
Are there any suggestions on how we can make sure that both internally
generated and external email reach both Gmail and Dovecot mailboxes
without creating a routing loop?
Our current idea is to rely on the existing Gmail dual delivery setup.
We'd like to know if it's possible to configure Postfix on
hedwig.simons-rock.edu so that:
1) Any email that originates on this system (or our roundcube webmail
instance on warlock.simons-rock.edu) is first routed out to Gmail
servers, even if the domain is simons-rock.edu and the user has a
Dovecot mailbox.
2) Any email that is routed to (or back to) our internal servers via
Gmail dual delivery (arriving via hormel.simons-rock.edu) is just
delivered to a Dovecot mailbox.
Thanks so much for any direction you can provide us. Should there be
more information you would like us to provide, we'll be happy to do so.
gratefully,
~c
--
Charlie Derr Director of Instructional Technology
Bard College at Simon's Rock https://simons-rock.edu
Encryption key: http://hope.simons-rock.edu/~cderr/
413-528-7344 Pronouns: he/him/his
