Greetings,
I've been running an ipv4-only postfix system for years, and have dialed
in a set of SMTP access/relay controls that work well for my use case.
I've avoided enabling ipv6 because its lack had yet to cause an issue,
and due to what I'm given to understand has been the wild-west nature of
v6 when it comes to SMTP.
However, it's becoming more desirable to enable v6. The ideal end goal
would be to use the same general set of controls as v4, but to start off
I would like to use a more permissive/less restrictive set of controls,
and initially only enable v6 for receiving (as that's where I anticipate
the majority of the issues).
I'm not entirely sure how to do this, so I am seeking recommendations &
guidance.
I looked to see whether the various smtpd_<foo>_restrictions statements
could take different actions depending on the address-family of the
connecting client (within the context of one main.cf file), but so far
have not found that this is possible.
My reading indicates that I could make an additional smtpd entry for v6
in master.cf with a different set of -o options than that used by v4 in
main.cf (inet_protocols = ipv6, inet_interfaces = a:b:c::d, mynetworks,
smtpd_<foo>_restrictions, etc).
Am I on the right track with the previous paragraph, or is/are there
better way(s) to accomplish this?
Sincerely,
Peter
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