From: Wietse Venema (wietseporcupine.org)
Date: Sat Mar 14 2009 - 18:38:51 CDT

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Wietse:
> I do not support configurations with multiple myhostname/mydomain
> settings (or multiple settings for any domain-like parameter that
> determines how Postfix handles email).

email builder:
> That's certainly fair. I can accept that I am stepping outside
> the use model with this and that maybe the sure bet would be to
> run multiple instances. I will, however, endeavor to test my idea
> and report back for others' edification if it works or not.

Wietse:
> Please, DO NOT share details of unsupported configurations.
>
> Postfix internals are being updated on an ongoing basis and I don't
> need the support load from people who find that your stuff no longer
> works.

email builder:
> Alright, I understand.
>
> However, I just realized that I actually might not need to change
> the domain. The -o overrides I need may only be the smtpd_tls_*
> settings. I was just concerned about name mismatches with the
> certificate, but whatever postfix thinks is the domain shouldn't
> affect the client's matching the domain name in the certificate
> itself to the domain it used to connect. Therefore, perhaps this
> proposal would NOT be outside the scope of what you find acceptable?
>
> 1.2.3.4:smtp inet n - n - - smtpd
> -o smtpd_tls_cert_file=/etc/postfix/domainA.crt
> -o smtpd_tls_key_file=/etc/postfix/domainA.key
>
> 4.3.2.1:smtp inet n - n - - smtpd
> -o smtpd_tls_cert_file=/etc/postfix/domainB.crt
> -o smtpd_tls_key_file=/etc/postfix/domainB.key

I see no multiple settings for the same host/domain parameters here.

Postfix also needs to know that it is final destination for [1.2.3.4],
[4.3.2.1] and for all the corresponding domain names, otherwise mail
for those destinations will loop.

You need to list 1.2.3.4 and 4.3.2.1 in main.cf:proxy_interfaces
if those addresses don't already match main.cf:inet_interfaces,
and you need to list all the corresponding host/domain names in
mydestination, if those host/domain names aren't already listed in
virtual_{alias,mailbox}_maps.

        Wietse

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