OPCTech
asked on
Exchange/.Brightmail Weirdness
We are seeing the strangest behavior in email flow.
We have a Sonicwall (TZ210) not doing any anti-spam filtering. All email flow is directed to the Brightmail GW to have spam and nasties filtered out. The valid emails are sent to the Exchange server 2010 (SBS 2011). All spam filtering on Exchange is disabled.
Clients get their emails using Outlook 2007.
The issue: some emails do not get through. A user in domain abc.com, sends an email and even gets a delivery receipt. But recipient never receives the email. Another user in same domain abc.com sends emails without issues to the recipient.
So it is not the domain being filtered out as spam source. Something is randomly (so it seems) blocking emails from certain users.
We are also using Symantec Endpoint on all client computers.
Any help would be appreciated.
Thanks
We have a Sonicwall (TZ210) not doing any anti-spam filtering. All email flow is directed to the Brightmail GW to have spam and nasties filtered out. The valid emails are sent to the Exchange server 2010 (SBS 2011). All spam filtering on Exchange is disabled.
Clients get their emails using Outlook 2007.
The issue: some emails do not get through. A user in domain abc.com, sends an email and even gets a delivery receipt. But recipient never receives the email. Another user in same domain abc.com sends emails without issues to the recipient.
So it is not the domain being filtered out as spam source. Something is randomly (so it seems) blocking emails from certain users.
We are also using Symantec Endpoint on all client computers.
Any help would be appreciated.
Thanks
Postmaster
The mail logs from the Sonicwall and Brightmail devices should hold the answer. They will indicate if the mail has been rejected and why.
One can always check the headers of the email to see the flow of the emails.
How to Extract Headers from Various Email Clients
http://mail.google.com/support/bin/answer.py?answer=22454
Message Header Analyzer:
http://mxtoolbox.com/EmailHeaders.aspx
I hope that would help
Sudeep
How to Extract Headers from Various Email Clients
http://mail.google.com/support/bin/answer.py?answer=22454
Message Header Analyzer:
http://mxtoolbox.com/EmailHeaders.aspx
I hope that would help
Sudeep
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