User Verification

[Stephen Swaney]

Randy,

A lot easier (and better) to do this in the MTA. A sendmail example
would be to use the virtusertable feature.

Enable sendmail to use the virtusertable feature, then create the
virtual user table with entries similar to:

joe at yourdomain.com                       joe at yourdomain1.com

jim at yourdomain.com              jim at yourdomain.com
sally at yourdomain.com            sally at yourdomain.com
@yourdomain.com                 error:nouser No such user here

A fuller explanation can be found at:
http://naughty.monkey.org/openbsd/archive/misc/0204/msg00846.html


On Tue, 2003-07-22 at 12:43, Randy Herban wrote:

> I have a question about how versitile mailscanner/spamassassin might be
> to do user verification.
>
> I've been thinkin about it for a while and my mentality was to have
> mailscanner do the verification, if the user doesn't exist, delete the
> mail and proceed onto the next, bypassing the rest of the checks as we
> won't be delivering this mail anyway.
> This has a nasty side as legit mail to a user who was just deleted
> wouldn't get bounced back.
>
> My next thought was to use a spamassassin type scoring to it.  For each
> nonexistent user we add a score of 1.  If there are that many to push it
> over the high spam score then it will get deleted but single messages
> (boucebacks) would go under the radar and get delivered fine.
>
> I know that I would be able to write this into mailscanner itself (being
> as it's a perl script) but not sure if it's possible to tie it into the
> spamassassin scoring.
>
> Does anyone with more knowledge have any input that might assist me?
>
> Thanks
> Randy
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