Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Exch07 - Large attachment got around limits, killed servers

Posted on 2009-05-19
1
Medium Priority
?
260 Views
Last Modified: 2012-05-07
I'm in the middle of performing a migration from one Exchange 07 server to another 07 server.  Both are setup as closely as possible in terms of roles (Mailbox, Hub Transport, CAS, UM) with similar settings.  Most of the users are still on the old server, some have been migrated to the new one.

There is a limit of 20MB for attachments set in Organizational Configuration-Hub Transport-Global Settings-Transport settings.  In Server Configuration-Hub Transport-Recieve connectors for both servers, the same limit is in place as well.

Yesterday, a user tried to email a 800MB video file.  Even though they got a non-delivery report saying the attachment was too large, it seems Exchange still attempted to process it.  Some of the symptons we saw included:

* An error email from Forefront saying it could not scan the message
* Users reporting emails from various sources not getting through (the first reported incident was scanned documents from multi-functions not being recieved)
* Our helpdesk website was generating "insufficient resources" errors
* Noone could send email, the items just sat in the outbox.
* The edgetransport.exe process was using higher than normal CPU

Steps taken after the incident was reported:

* Looked up the "insufficnet resources" error, which suggested not enough disk space for the queue.  Both servers had more than enough space.
* The event log had entries relating to resource pressure increase for the Version Buckets, as well as the Hub Transport service not responding.
* Reviewed the mail queues and found them backing up
* Reviewed the message logs and found entries relating to the cause, with interaction between both servers in these entries

We found that there were 2 emails with very large attachments, with the details matching the error emails generated by Forefront.  After deleting them, service appeared to return to normal.

Is there anything I missed in the configuration of the server?  The NDR email suggests the attachment limits, but the message log entries and the resulting problems suggest that it didn't work properly.  Any ideas, suggestions, etc would be appreciated.  Thanks.
0
Comment
Question by:Jesse B
[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
1 Comment
 
LVL 26

Accepted Solution

by:
jar3817 earned 1500 total points
ID: 24467095
It didn't really get around the limit,  because it sent an NDR, which I'm sure didn't help matters since it was an 800MB NDR.

A message of that size is going to mess all sorts of things up, no matter what measures you have setup. At the very least you should tar and feather this user as an example to the others.
0

Featured Post

Veeam Task Manager for Hyper-V

Task Manager for Hyper-V provides critical information that allows you to monitor Hyper-V performance by displaying real-time views of CPU and memory at the individual VM-level, so you can quickly identify which VMs are using host resources.

Question has a verified solution.

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

This article will help to fix the below error for MS Exchange server 2010 I. Out Of office not working II. Certificate error "name on the security certificate is invalid or does not match the name of the site" III. Make Internal URLs and External…
Are you an Exchange administrator employed with an organization? And, have you encountered a corrupt Exchange database due to which you are not able to open its EDB file. This article will explain all the steps to repair corrupt Exchange database.
In this video we show how to create a Resource Mailbox in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: Navigate to the Recipients >> Resources tab.: "Recipients" is our default selection …
To show how to generate a certificate request 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 Servers >> Certificates…

721 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