secure lmtp connection between sendmail and cyrus

[Marcus Schopen]

Am Samstag, den 15.02.2014, 18:56 +0100 schrieb Marcus Schopen:
> Hi,
> 
> I'm looking for a secure and stable way to connect sendmail (8.14.4) and
> cyrus (2.4.12) in case of both hosts not running on the same machine or
> in the same local secure subnet.
> 
> What is a practical way? An openvpn (tcp or udp?) connection between
> sendmail and cyrus and starting lmtpd with -a option at the tunnel's
> end?
> 
> Or a LMTPs connection with LMTP_AUTH, but couldn't find any good example
> configs how to configure sendmail to use LMTP_AUTH und TLS to talk to
> cyrus.

LMTP_AUTH connections via access

# client AUTH
AuthInfo:IP "I:testuser" "P:test

and put testuser to lmtp_admins on cyrus side
lmtp_admins: testuser

But this is still not secure of course. Would a openvpn or tinc tunnel
be faster instead of a LMTPs connection?

Ciao
Marcus