[ZCM] [ZC] 2319/ 6 Comment "MailHost sends duplicate emails on zodb conflicts"

Issue #2319 Update (Comment) "MailHost sends duplicate emails on zodb conflicts"
 Status Pending, Zope/bug medium
To followup, visit:
  http://www.zope.org/Collectors/Zope/2319

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= Comment - Entry #6 by ajung on May 2, 2007 1:07 am

"for most users" = you only send a minor number of mails out of Zope. If you have to send to lot of emails (for newsletters etc).
MDH is still the choice. Installing MDH for low-level mail situations would be overkill and a zero-configuration solution for the problem would be of advantage for most users.
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= Comment - Entry #5 by jens on May 2, 2007 12:49 am

It does not make MaildropHost obsolete at all. You're overlooking the asynchronous mail delivery, which is its main purpose. The transaction awareness was just a secondary feature.

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= Comment - Entry #4 by ajung on May 2, 2007 12:35 am

+1 for accepting such a patch for Zope 2.11 since it makes
MailDropHost obsolete for most users (sorry Jens :-)) sending out a number of mails from time to time.
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= Comment - Entry #3 by ajung on May 2, 2007 12:35 am

+1 for accepting such a patch for Zope 2.11 since it makes
MailDropHost obsolete for most users (sorry Jens :-)) sending out a number of mails from time to time.
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= Comment - Entry #2 by tseaver on May 2, 2007 12:27 am

Thanks for the patch.  A couple of issues:

  - The whitespace in the patch is messed up -- please normalize,
    removing any tab characters.

  - This kind of change really needs unit tests;  can you
    please supply some? 

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= Request - Entry #1 by marc_mengel on May 1, 2007 7:53 pm


Uploaded:  "mail.patch"
 - http://www.zope.org/Collectors/Zope/2319/mail.patch/view
If you have a script or action that sends email and does other work, that gets a ZODB conflict error, the mail gets sent a second (or third!) time as the conflict resolution runs again.  We noticed this in particular with AlphaFlow where several workflow items were occurring in a row, but it can happen any time you have a script that sends email and updates a ZODB object.

A resource manager for sending email solves this problem.

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