On Wed, Aug 29, 2001 at 01:27:06PM +1200, Ewen McNeill wrote:
Not to rain on anyone's parade, but most mailing list software
injects messages in queue mode (to avoid an explosion of MTA
processes trying to send the messages out immediately (in the
background)). This then relies on the MTA queue processing to
shift the messages out.
And for sendmail this sucks... you'll have one message with lots of
recipients, and it will try to deliver to them, one at a time more or
less, which is completely insane.
If it's every 30 minutes it'd pretty much exactly explain the
times reported. If it's every 15 minutes (a common default with
sendmail), then 15-minutes plus isn't that unlikely to happen
given the right circumstances.
No, that's another effect --- and while you mention it sendmail (and
most other MTAs) have broken retry logic to... if a message fails time
after time, trying every n seconds in insane, you only load up the
sending MTA and also create much unecessary traffic.
Anyone who has a system which processes 10+ messages/second can tell
you how nasty this is when you loose connectivity for an hour or
For a mailing list of a few hundred addresses, it should be a walk
in the park for most MTAs, sendmail included.
Except that it's broken. If the list contains the addresses:
and the MTAs (or whatever) for panties.org
are busted --- guess what?
Sendmail will try for five minute or so before moving on to
That behavior is so poor it can only be described as broken.
I've used sendmail plenty in the past, I choose not to use it these
days because there are better alternatives. I'm astounded by the
number of people who continue to use it, when, for most people, there
are better designed, more secure and simpler alternatives.
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