Solved

Exchange/.Brightmail Weirdness

Posted on 2012-03-12
5
68 Views
Last Modified: 2016-02-21
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
0
Comment
Question by:OPCTech
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
5 Comments
 
LVL 16

Expert Comment

by:Postmaster
ID: 37717508
The mail logs from the Sonicwall and Brightmail devices should hold the answer. They will indicate if the mail has been rejected and why.
0
 
LVL 30

Expert Comment

by:Sudeep Sharma
ID: 37728318
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
0
 

Accepted Solution

by:
OPCTech earned 0 total points
ID: 37757040
I finally found the problem: Brightmail, by default deletes all emails containing unscannable attachments. Since some documents are unscannable by their very nature, a certain amount of apparently random emails were being junked.
I have adjusted the AV filter to allow unscannable documents

Thanks
0
 
LVL 16

Expert Comment

by:R. Andrew Koffron
ID: 41474220
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
0

Featured Post

Forrester Webinar: xMatters Delivers 261% ROI

Guest speaker Dean Davison, Forrester Principal Consultant, explains how a Fortune 500 communication company using xMatters found these results: Achieved a 261% ROI, Experienced $753,280 in net present value benefits over 3 years and Reduced MTTR by 91% for tier 1 incidents.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Following basic email etiquette rules will help you write a professional email and achieve a good, lasting impression with your contacts.
How to resolve IMCEAEX NDRs in Exchange or Exchange Online related to invalid X500 addresses.
In this video we show how to create an Accepted Domain in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Mail Flow >> Ac…
This video demonstrates how to sync Microsoft Exchange Public Folders with smartphones using CodeTwo Exchange Sync and Exchange ActiveSync. To learn more about CodeTwo Exchange Sync and download the free trial, go to: http://www.codetwo.com/excha…

751 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question