Exchange 2010 blank calender request from single domain

lhiadmin
lhiadmin used Ask the Experts™
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Exchange 2010 Server when a Calendar request is received from one specific domain the email is blank with no accept or decline options.  The sending domain is exchange online.  The server accepts calendar request from other domains on the same exchange online tenant.
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Commented:
What happens when you try from OWA?
Please post a screenshot if possible.

Author

Commented:
OWA from domain is sent with correct attachments.  email received at 2010 Exchange server and processed to user with no attachment, email is blank.

Author

Commented:
email flow is outside domain => email host => POP3 puller to Exchange => Exchange 2010 to user.

email received at email host has attachments files and are correct.  POP3 puller shows pull of email with attachments to Exchange 2010.

forefront for exchange is installed but disabled and all forefront services are stopped and disabled.

I have disabled all transport filters - restarted transport service - processed email from single effected domain with same result.

calendar invites from other domains process normally with attachments.

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