Conrad G T Yoder writes: > On May 15, 2014, at 8:48 PM, Stephen J. Turnbull <step...@xemacs.org> wrote:
> > The log you display is not a true bounce. > > Gotcha. I guess someone thought it was a true bounce and > configured their servers appropriately. :^) Could be. The other possibility is that you have enough Roadrunner subscribers that when a post goes out, one connection gets through, a bunch get a temporary fail and requeued. 4 hours later, your MTA tries a bunch and one gets through. A bunch minus 1 get a temporary fail, and requeued. 8 hours later, your MTA tries a bunch minus 1 and one gets through. A bunch minus 2 get a temporary fail, and requeued. This happens up to 5 times with approximately exponential backoff. If the 5th retry fails, it will be considered a permanent failure (by your MTA). So if "a bunch" is bigger than 5, you'll get "true bounces". If any of these retries overlaps with a new post, the problem gets compounded. (All the concrete numbers depend on your MTA's configuration, but they're pretty typical, I believe). At this point, it should be clear why I consider Roadrunner's policy to be braindamaged. They're wasting your resources and DoS'ing their own users. BTW, it should be possible to reconfigure your Mailman and MTA so that Mailman sends the maximum number of addresses per SMTP connection (for this you need to turn personalization OFF) permitted by Roadrunner in one shot, and the MTA does as well. It may be possible to get your MTA or Mailman to sequence contacts to Roadrunner so that only one SMTP connection is open at a time. Maybe Roadrunner will tell you what the relevant numbers are, or even give you a higher limit. Nevertheless, as long as they have this policy, the possibility of a retry cascade exists. And the numbers that Roadrunner offers may be much smaller than your MTA's optimal configuration from your point of view. > I have not yet tried the nuclear option - the infamous EECB > (Executive Email Carpet Bomb). Bu-wha-ha-ha-ha! But I hope things don't go that far. Steve ------------------------------------------------------ Mailman-Users mailing list Mailman-Users@python.org https://mail.python.org/mailman/listinfo/mailman-users Mailman FAQ: http://wiki.list.org/x/AgA3 Security Policy: http://wiki.list.org/x/QIA9 Searchable Archives: http://www.mail-archive.com/mailman-users%40python.org/ Unsubscribe: https://mail.python.org/mailman/options/mailman-users/archive%40jab.org
