zope.sendmail doesn't handle SMTP errors

[Marius Gedminas]

If you try to send an email with a malformed sender/recipient address, the SMTP server will reject it, smtplib will raise a smtplib.SMTPRecipientsRefused exception, and the blanked except clause in zope.sendmail.delivery will log it and continue trying to re-send the same malformed message every 3 seconds.

If you use mail:directDelivery instead of mail:queuedDelivery, that exception will happen (and be uncaught) in the second phase of the transaction commit, which can't be good either.

[Matthew Grant (grantma)]

zope.sendmail also does not handle these events gracefully:

o SMTP Error 45x - temporary error

o Temporary failure to connect() to the MTA to start delivery of a message

o Failure of SMTP TCP connection during SMTP session

I am just finishing writing code that will handle all this gracefully, I will add the SMTPRecipientsRefused Exception handling to it as well.

[Albertas Agejevas (alga)]

The fix for the permanent errors has been comitted in rev 82358 (end of December 2007), released in zope.sendmail 3.5.1.