Hi! I have recently been doing a lot of work on zope.sendmail, and would like to commit a lot of fixes, namely for: 1) Handling of SMTP error 451 etc. 2) Cleaning stale lock links out of the queue 3) Handling Server disconnection 4) Handling of connect() failure The above are fixes for Bug #157104 https://bugs.launchpad.net/zope3/+bug/157104 5) A bit of a clean up QueueProcessorThread so that it complies with IMailQueueProcessor in interfaces.py This is a condition were Zope is restarted - there is a little bit of a race here with duplicate messages where if the zope.sendmail delivery thread exits for some reason after a successful SMTP delivery and has not yet removed the lock link, but that has such a small chance of happening - compared to all the other faults in zope.sendmail this is minor ... I would be willing to become the maintainer for zope.sendmail Best Regards, Matthew Grant