Re: Whether to set masquerade_classes

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Whether to set masquerade_classes
\ D G Teed (23 Oct 2007)
. \ D G Teed (24 Oct 2007)

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Subject:	Re: Whether to set masquerade_classes
Group:	Postfix-users
From:	D G Teed
Date:	24 Oct 2007

Somehow, difficult problems which I post to a mailing list usually
become resolved within a few hours. I see what our problem was now.
We actually had $mydomain in front of !subdomain.example.com
in the masquerade_domains list. I had not noticed before that it is
parsed from left to right and first match wins. Putting the
negation case in front (left) fixed the problem.

--Donald

On 10/23/07, D G Teed <donald.teed> wrote:
> We have 2 inbound only MX and 1 outbound SMTP - all unique postfix instances.
>
> There is a subdomain for which we do not handle the email, and so
> the DNS MX entry handles the pointer to who does MX that email,
> and on outbound SMTP we use:
> masquerade_domains = !subdomain.example.com $mydomain
> This set up worked OK for preventing the @subdomain.example.com
> being altered on the From line.
>
> Now we have an issue where the users receiving the message don't
> see @subdomain.example.com on the To: line, but rather @example.com
> (but it does deliver OK to @subdomain.example.com through our outbound
> SMTP). The docs I see say that the headers shouldn't be impacted
> by default, so I don't understand why this is happening.
>
> I'm thinking of using masquerade_classes, but I don't see any examples
> of living purpose to using each of the four possible settings. I'm reading
> that if I set up all four possible settings, then SMTP can't do
> delivery to our mail server inbox machines directly through virtual lookups - it
> would need to send it out to our MXes to process.
>
> What would happen if I only set up header_sender, header_recipient
> for masquerade_classes? Would that prevent the rewrite of the subdomain
> in the email headers while still allowing for local delivery from SMTP
> directly to our various email servers referenced in virtual?
>
> Regards,
>
> --Donald
>