Exchange calendar invites causing nasty mail loops!

[goo0h]

We've got one individual (but there may be others I haven't heard of yet) that whenever they receive a calendar invite from an Exchange user, a nasty mail loop ensues. Has anybody else had problems with calendar invites from Exchange?

Suppose user@zimbra is the one experiencing the mail loop, and user@exchange is the one sending the invite. When user@exchange sends a calendar invite to user@zimbra, this Zimbra user's inbox will be flooded--until they hit their quota limit--with thousands of duplicates of this calendar invite. I noticed the messages have tons of lines like these:

X-Virus-Scanned: amavisd-new at ourserver
X-Virus-Scanned: amavisd-new at ourserver
X-Virus-Scanned: amavisd-new at ourserver
X-Virus-Scanned: amavisd-new at ourserver
X-Virus-Scanned: amavisd-new at ourserver

Here's a brief excerpt from maillog.

2010-03-05 00:03:41,387 INFO [LmtpServer-223233] [ip=ouripaddress;] lmtp - Delivering message: size=211089 bytes, nrcpts=1, sender=user@exchange, msgid=<1492373491.177354.1267766729574.JavaMail.ro ot@ourserver>
2010-03-05 00:03:41,393 INFO [LmtpServer-223232] [ip=ouripaddress;] lmtp - Delivering message: size=284473 bytes, nrcpts=1, sender=user@exchange, msgid=<654543512.177359.1267766730326.JavaMail.roo t@ourserver>
2010-03-05 00:03:41,676 INFO [LmtpServer-223232] [name=user@zimbra;mid=878;ip=ouripaddress;] calendar - Got malformed invite that lists attendees without specifying an organizer. Defaulting organizer to: mailto:user@exchange
2010-03-05 00:03:42,028 INFO [LmtpServer-223232] [name=user@zimbra;mid=878;ip=ouripaddress;] calendar - Got malformed invite that lists attendees without specifying an organizer. Defaulting organizer to: mailto:user@exchange
2010-03-05 00:03:42,232 INFO [CalendarInviteForwardSender] [] calendar - Got malformed invite that lists attendees without specifying an organizer. Defaulting organizer to: mailto:user@exchange
2010-03-05 00:03:42,600 INFO [CalendarInviteForwardSender] [] calendar - Got malformed invite that lists attendees without specifying an organizer. Defaulting organizer to: mailto:user@exchange
2010-03-05 00:43:41,220 INFO [LmtpServer-223335] [ip=ouripaddress;] lmtp - Delivering message: size=211089 bytes, nrcpts=1, sender=user@exchange, msgid=<1492373491.177354.1267766729574.JavaMail.ro ot@ourserver>
2010-03-05 00:43:41,221 INFO [LmtpServer-223334] [ip=ouripaddress;] lmtp - Delivering message: size=284473 bytes, nrcpts=1, sender=user@exchange, msgid=<654543512.177359.1267766730326.JavaMail.roo t@ourserver>
2010-03-05 00:43:41,546 INFO [LmtpServer-223334] [name=user@zimbra;mid=878;ip=ouripaddress;] calendar - Got malformed invite that lists attendees without specifying an organizer. Defaulting organizer to: mailto:user@exchange
2010-03-05 00:43:41,787 INFO [LmtpServer-223334] [name=user@zimbra;mid=878;ip=ouripaddress;] calendar - Got malformed invite that lists attendees without specifying an organizer. Defaulting organizer to: mailto:user@exchange
2010-03-05 00:43:41,986 INFO [CalendarInviteForwardSender] [] calendar - Got malformed invite that lists attendees without specifying an organizer. Defaulting organizer to: mailto:user@exchange
2010-03-05 00:43:42,393 INFO [CalendarInviteForwardSender] [] calendar - Got malformed invite that lists attendees without specifying an organizer. Defaulting organizer to: mailto:user@exchange
2010-03-05 01:53:41,460 INFO [LmtpServer-223480] [ip=ouripaddress;] lmtp - Delivering message: size=211089 bytes, nrcpts=1, sender=user@exchange, msgid=<1492373491.177354.1267766729574.JavaMail.ro ot@ourserver>
2010-03-05 01:53:41,461 INFO [LmtpServer-223479] [ip=ouripaddress;] lmtp - Delivering message: size=284473 bytes, nrcpts=1, sender=user@exchange, msgid=<654543512.177359.1267766730326.JavaMail.roo t@ourserver>

[goo0h]

So I guess nobody has ever encountered anything like this? Happened again hereby a Zimbra user got an Exchange calendar invite, and ended up with 4,000 copies of that message before I created a filter for the user to delete that mail.

[ThomS]

Hi goo0h,

I also came across this issue. We are running on Zimbra 6.0.8 and I noticed in the logs that the user from which the original invite originated is using the Zimbra Connector for Outlook.

Our logfiles show exactly the same as the ones you mention. Have you (or anyone else) been able to resolve this issue?

Thanks, Thom