Multiple Postfix smtp instances

[Dhawal Doshy]

Jan Brinkmann wrote:
> Hi,
> 
> is it possible to have multiple smtpd instances of postfix running on
> different IPs where one instance is simple running to do SASL based
> mail relaying (without mailscanner) and the other one can act as the
> MX for virtual domains? On servers where I use amavis, it's possible
> to specify multiple smtpd lines where one has the content_filter set
> to an empty string. I thought it would also be possible to do this
> with header_checks, but it doesnt work as expected:
> 
> 1.2.3.4:smtp      inet  n       -       n       -       -    smtpd
>   -o header_checks=
> 1.2.3.5:smtp      inet  n       -       n       -	-    smtpd
> 	
> The second instance (the one listening on 1.2.3.5) would be the one
> where the mails are set to a HOLD state to enable mailscanner. The
> other one would be the one which is used to relay mails for sasl
> authenticated users. If I try to do it this way, all mails get
> filtered by mailscanner. If I go the other way, with header_checks
> in main.cf set to an empty string and header_checks defined in the
> master.cf no mails get scanned at all:
> 
> 1.2.3.4:smtp      inet  n       -       n       -       -    smtpd
>   -o header_checks=regexp:/etc/postfix/mailscanner_hold
> 1.2.3.5:smtp      inet  n       -       n       -       -    smtpd
>  
> 
> Any ideas if this can be done, and which way would be correct?

See..
http://www.postfix.org/BUILTIN_FILTER_README.html#remote_only
http://www.seaglass.com/postfix/turning_off_body_checks.html

You approach is right, just use the 
receive_override_options=no_header_body_checks option..

- dhawal