Voytek:
> I have a user who can not receive emails as his correspondent's domain is 
> currently on multiple rbls.
> 
> As an interim measure, should I look at temporarily allowing this domain?
> 
> Or, is that a bad idea, shouldn't consider such temp workarounds?

It should be possible to make an unsafe exception.

Somewhere in your access rules you'd stick:

    check_sender_access pcre:/etc/postfix/sender_access.pcre

With:

/etc/postfix/sender_access.pcre:
   /^username@ckchaiseree\.com$/ DUNNO
   .   reject_rbl_client xxx.xxx, reject reject_rbl_client yyy.yyyy, ...

It should be possible to just specify all this in main.cf. 
For example:

    check_sender_access multimap:{
        inline:{
            [email protected]=DUNNO
        }
        static:{
            reject_rbl_client xxx.xxx, reject reject_rbl_client yyy.yyyy, ...
        }
    }

Prettyprinting this with "postconf -n" remains a challenge.

        Wietse

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