[Mimedefang] Filter by sender/recipient

[Richard Whelan]

Hi,

Yesterday one of our customer mail relays received a slight (under 
exaggeration) increase of mail traffic through it. The normal 10000 or 
so in/out, jumped to over 150000. In theory this should have been no 
problem at all, however, the majority of the mail didn't deliver which 
instead mailed out the same volume of postmaster emails. These 
unfortunately hit out main MTAs, which both have MD+SA. Strangely 
enough, for hours on end, the machines were constantly maxed out, with 
35 separate MD processes, temp failed huge amounts of mail, which is 
still trickling in from the backup MX servers.

What I would like to do, is put a check into MD to test against either 
recipient or sender, depending on which is the easiest and less 
intensive, and bail out immediately instead of going through the full 
MD/SA checks. Considering the amount of mail that goes into the 
postmaster mailbox, allowing through a little spam, is relatively 
insignificant.

Where is the best place to add a check, and does anyone have a simple 
example, as my perl is, well it's better to say it isn't.

Thanks in advance,

Richard

-- 
Richard Whelan
Senior Systems Administrator
PIPEX

Direct:  +44 (0) 1865 381568
Mobile:  +44 (0) 7786 276020

website: http://www.pipex.net/
 
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