Order in which MailScanner processes mail

[Ronny T. Lampert]

>   i have a server with traffic of around 50/60.000 mail a day. Lately it is
>   giving a great amount of problems in delay in which it processes mail. 
> 
>   Some mail stay in the queue for as long as several hours, other are
>   delivered in a couple of minutes. That creates real problems and I cannot
>   understand why that happens.


A problem that only recent had a serious impact on me (scanning times 
went from 0.5X to 8.X + seconds):

Your DNS servers. Check them so they're fast, have caching on and check 
that all forwarders are valid and also operating as expected.

Cheers,
Ronny