sender verification

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Don't think it could be done selectively but you could put this in your
sendmail.mc

FEATURE(`greet_pause',`30000')dnl

Then do your m4 rebuild.

Spermmers are very inpatient.

On 5/11/05, Jim Holland <mailscanner at mango.zw> wrote:
      Hi Jan-Peter

      On Wed, 11 May 2005, Jan-Peter Koopmann wrote:

      > > 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.
      >
      > I use DNSBL at MTA level and with SpamAssassin. If the IP
      triggers one
      > of two RBLs I trust the message is rejected. If it hits one
      of several
      > other RBLs I slow down the SMTP protocol (enforcing
      synchronization) and
      > catch quite a lot of spam with that.

      I am not familiar with how to slow down the SMTP connection
      selectively -
      I don't think this is a feature that sendmail offers.

      > To be honest: I would think of this as unneccessary
      overhead. Why don't
      > you simply verify the sender address at MTA level, add a
      header to the
      > message in case the verify fails and then write a simple
      SpamAssassin
      > rule for this? That's what we do here. It's quick and no
      code has to be
      > changed. I'm not sure how easy this is with sendmail but
      with exim this
      > is a matter of minutes.

      Again, I don't know of any easy method of doing this with
      sendmail without
      writing a special milter.

      > New code in MailScanner only brings the possibility of new
      errors as the
      > code gets more and more complex, especially since the
      feature you want
      > would mean implementing/using SMTP. The only advantage
      would be that
      > people not using SpamAssassin could use this functionality.
      I doubt
      > there are many people out there that fit this definition
      though. :-)

      Sadly I am in fact in this category.  The current server
      could not cope.
      However there is a new server sitting on my desk that I have
      just loaded
      with CentOS (RHEL4 clone).  Now to try Exim, SpamAssassin etc
      . . .

      Thanks for your feedback.

      Regards

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

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