[rt-users] Creating tickets from mails without usercreation

[Jerrad Pierce]

> - If creating users is inevitable on initial import of mails, then it should
>  be possible for the user to be autoremoved again after the ticket
>  which created them has been removed.
I agree: http://rt3.fsck.com/Ticket/Display.html?id=13758
We have several special system users, and a user having no tickets
is not an adequate filter for cleaning out lusers with Shredder, and it
doesn't offer appropriate limits so we have to be careful to manually
uncheck each of them when shredding users.

> Is something like that possible without perl customisations?
> If yes, how?
> If no, any hints on where/how to implement it?
http://wiki.bestpractical.com/view/SpamFiltering

Covers plenty of ways to handle SPAM. I just cleaned it up a bit
so it should be a bit easier to follow now.
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