doesn't zip with greylisting

Gary Mills mills@cc.UManitoba.CA
Thu Dec 18 02:37:18 UTC 2003

I had a complaint that e-mail from users was no longer
working since I set up greylisting on our mail servers.  To confirm
this, I set up a free e-mail account on, and sent myself
some mail.  This showed up in the sendmail log:

  Dec 17 20:01:35 electra sm-mta[22449]: [ID 801593] hBI21WiJ022449: to=<>, delay=00:00:02, pri=30750, stat=mail hBI21WiJ022449 from temporary greylist embargoed

A message beginning this way also appeared in my INBOX:

  Mail Delivery Error.
  Unable to Deliver to the following recipient(s).
  <>: 4.2.1 mail hBI21WiJ022449 from 
  temporary greylist embargoed

Apparently,'s e-mail system treats this as a permanent
failure, and does not retry delivery.  I'm not impressed!

Are there any other mail systems that behave this way?  Is there
anything I can do in DCC to allow their mail to get through?  They
seem to use a bunch of outgoing SMTP servers.  I suppose that
greylist whitelisting by HELO or mail host are my only choices.

-Gary Mills-    -Unix Support-    -U of M Academic Computing and Networking-

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