sender verification

[Jim Holland]

On Wed, 11 May 2005, Julian Field wrote:

> The whole point of milter-sender and milter-ahead is that they are
> implemented at the SMTP acceptance phase, and reject the message without
> any local processing overhead if the checks fail. MailScanner does not
> get involved with the SMTP conversation at all, I leave that to the MTA
> (ie sendmail in this case), so it can't replace the functionality of a
> milter as it doesn't get processed until later on, once the message has
> been accepted.

Yes, I realise that, but that is not what I am looking for, as blocking
mail at the SMTP stage could lead to unacceptably high rejection rates of
legitimate mail.  That is why I would like to see this being implemented
after receipt of the message - just as DNSBL and other checks are carried
out afterwards by MailScanner.  It means that retrieval from quarantine,
and whitelisting of specific addresses could be implemented consistently
with other MailScanner features.

> Jim Holland wrote:
>
> >Hi Julian
> >
> >I see that there has been some discussion earlier about the use of
> >milter-sender with sendmail to verify that the sender's address does exist
> >before accepting mail.  That then allows mail to be rejected at connection
> >time if the sender's address seems to be fraudulent.
> >
> >I like the idea behind milter-sender, but would much prefer it to be
> >integrated with MailScanner rather than sendmail, so that false positives
> >(eg no-reply type addresses and other mail blocked due to problems that
> >are sure to arise) result in mail being quarantined rather than bounced.
> >Is this an option that you would be interested in accepting on the
> >wishlist for future development of MailScanner?
> >
> >Regards
> >
> >Jim Holland
> >System Administrator
> >MANGO - Zimbabwe's non-profit e-mail service
> >
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> >
>
> --
> Julian Field
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Regards

Jim Holland
System Administrator
MANGO - Zimbabwe's non-profit e-mail service

------------------------ MailScanner list ------------------------
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'leave mailscanner' in the body of the email.
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Support MailScanner development - buy the book off the website!