Thomas,

> During the last days I encountered a few mails containing nothing but a
> single line with many whitespaces (> 15000) within their body. These
> mails are able to completely block an amavisd-new process (nanny reports
> "went away").

My guess is that you are bitten by a Linux regexp library problem,
triggered by the file(1) utility (it doesn't affect for example FreeBSD
with the same version of a file utility). It has been discussed before
on this ML. Also mentioned in: http://www.amavis.org/security/asa-2007-3.txt
in section 4.

  Mark

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