Solved

Exchange/.Brightmail Weirdness

Posted on 2012-03-12
5
48 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
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 29

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

NAS Cloud Backup Strategies

This article explains backup scenarios when using network storage. We review the so-called “3-2-1 strategy” and summarize the methods you can use to send NAS data to the cloud

Question has a verified solution.

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

Suggested Solutions

This process describes the steps required to Import and Export data from and to .pst files using Exchange 2010. We can use these steps to export data from a user to a .pst file, import data back to the same or a different user, or even import data t…
Scam emails are a huge burden for many businesses. Spotting one is not always easy. Follow our tips to identify if an email you receive is a scam.
In this video we show how to create a Distribution Group 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 Recipients >>…
In this Micro Video tutorial you will learn the basics about Database Availability Groups and How to configure one using a live Exchange Server Environment. The video tutorial explains the basics of the Exchange server Database Availability grou…

773 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