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Cannot receive calendar invitations, but email is fine from specific domain

Morning,

I have an interesting query where we happily receive our clients emails, but not his calendar invites.  I cannot see why not for the life of me.

We use Exchange 2010, we route our email through Symantec Cloud/Message Labs and have Sophos Pure Message installed as well.

Looking at the Symantec Cloud Track and Trace Logs, the invites are rejected by our Exchange server:

2013-01-16 10:24:32
Connection from: 91.220.42.83 (service145.mimecast.com)
2013-01-16 10:24:32
Sending server HELO string:service145.mimecast.com
2013-01-16 10:24:32
Message id:OF085A2065.F0B107ED-ON80257AF5.00392F13-80257AF5.00392F2D@turntown.co.uk
2013-01-16 10:24:32
Message reference: 135833187200000157503200001193012
2013-01-16 10:24:32
Sender: iwona.stuczynska@turntown.co.uk
2013-01-16 10:24:32
Recipient: simon.johns@davidchipperfield.co.uk
2013-01-16 10:24:32
SMTP Status: OK
2013-01-16 10:24:32
Delivery attempt #1
2013-01-16 10:24:32
Recipient server: 62.173.127.26 (62.173.127.26)
2013-01-16 10:24:32
Response: 451 4.4.2 [internal] connection closed by remote host
2013-01-16 10:31:31
Delivery attempt #2
2013-01-16 10:31:31
Recipient server: 62.173.127.26 (62.173.127.26)
2013-01-16 10:31:31
Response: 451 4.4.2 [internal] connection closed by remote host
2013-01-16 10:44:39

I cannot see why email from same sender is accepted, calendars are not.

Below is email delivery from same sender to same recipient:
2013-01-16 10:36:45
Connection from: 91.220.42.83 (service145.mimecast.com)
2013-01-16 10:36:45
Sending server HELO string:service145.mimecast.com
2013-01-16 10:36:45
Message id:OF1A7A177C.2684124A-ON80257AF5.0038E06C-80257AF5.003A4D6C@turntown.co.uk
2013-01-16 10:36:45
Message reference: 135833260400000192408370001039015
2013-01-16 10:36:45
Sender: iwona.stuczynska@turntown.co.uk
2013-01-16 10:36:45
Recipient: simon.johns@davidchipperfield.co.uk
2013-01-16 10:36:45
SMTP Status: OK
2013-01-16 10:36:49
Delivery attempt #1 (final)
2013-01-16 10:36:49
Recipient server: 62.173.127.26 (62.173.127.26)
2013-01-16 10:36:49
Response: 250 2.6.0 [InternalId=1131838] Queued mail for delivery
0
IT_Chipperfield
Asked:
IT_Chipperfield
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1 Solution
 
AmitIT ArchitectCommented:
What email software used by your client. I remember same issue, where calendar invites are stuck or failed to delivery. You need to ask client to check at their end.
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IT_ChipperfieldAuthor Commented:
Hi - they are using Lotus Notes!  I have asked the client to check their end too.
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AmitIT ArchitectCommented:
Ask them to sent a test invite to your public account like Gmail or Yahoo that can confirm where is the issue.
0
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IT_ChipperfieldAuthor Commented:
Yes - invitations reach other recipients, we receive other calendar invites - just not from this one domain.  We do get their email though.

...Simon
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IT_ChipperfieldAuthor Commented:
All fixed - our Watchguard IPS was denying the mail with calendar attachments from the specific domain.
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IT_ChipperfieldAuthor Commented:
Need to analyse the IPS now ton understand why...
0

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