Hello,

We plan to add the possibility for our users to choose that messages 
categorized as spam are put on the hold queue instead of the default 
reject. Thus it'll be possible to release the false positives, which 
can make life easier for them.

Currently I can see two ways to accomplish it, both have got pros and 
cons.

a. Single postfix instance with large enough queue partition. Easier,
   simpler, however if the queue partition becomes full, the normal 
   traffic is blocked as well.

b. Two postfix instances, the first one sends the messages to be held
   to the second one via a selected transport. (Two policy daemons are
   required as well.) The first instance handles all the good traffic 
   and diverts the bad one to the second instance, which has the single
   job to put messages onto its hold queue and release from there. 
   That way the hold queue can be separated and moved to a second 
   partition. Still, if the second instance stops working for whatever
   reason, the messages to be held will stuck at the first instance.

How could one achieve that the held messages are separated from the normal 
traffic (i.e. hold queue on another partition), but if the messages cannot 
be held, then those gets rejected instead of queued?

Best regards,
Jozsef
-
E-mail  : kad...@blackhole.kfki.hu, kad...@mail.kfki.hu
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