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Can't receive meeting requests

By MattsDad ·
My Domain (X) cannot receive meeting invitations from Domain Y.

Email goes back and for the between the two domains all day with no problems as do meeting requests from X to Y.....just not the reverse.

Senders on the Y domain get this error message:

The e-mail system was unable to deliver the message, but did not report a specific reason. Check the address and try again. If it still fails, contact your system administrator.
< (mail server name for Y) #4.0.0 X-Postfix; lost connection with (X mail server name and IP) while sending MAIL FROM>

We are baffled! This problem started abruptly. There were no changes in this domain but we believe that domain Y started using CAC cards just a few days after we got out last received meeting request from domain Y.

Any ideas? we are desperate!

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by furdog22 In reply to Can't receive meeting req ...

I had this very same problem last week. Check your firewalls smtp settings. Ours was blocking the vcalandar. hope this helps....Good luck

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by Tmacs In reply to Can't receive meeting req ...

Same solution,
Have a Sonicwall 3060 firewall, under Security Services, Intrusion Prevention. IPS Policies-SMTP I had to disable vCalander prevention but left Detection enabled.

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