Message Size Exceeds Size Limit Even Though Limit is Higher

Our client often gets complaint's from their customers not being able to send attachments through to them because they continuously get rejected for being too large.

They're using an on-prem 2010 Exchange server.  
The initial message size limit send/receive was set to 30MB.
Their hosted anti-spam solution, Trend micro, has a limit set for 50MB.
I changed the on-prem 2010 Exchange server send/receive to a limit of 50MB for troubleshooting purposes.

We still get bounce backs when sending anything typically over the size limit of 15MB. The message comes back indicating it exceeds the limit of 20MB.  After checking all the settings (that I know of), I don't know where the size limit of 20MB is being set.  I know that messages grow in size beyond the initial attachment limit, but not to this degree.

Is there anything specifically I've missed in checking?

Thank you!
servicadAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

timgreen7077Exchange EngineerCommented:
check the size limits on the send and receive connectors, and the organizational level settings.
0
Jason CrawfordTransport NinjaCommented:
Check these four locations:

Get-TransportConfig | Select-Object MaxReceiveSize,MaxSendSize
Get-ReceiveConnector | Select-Object name,MaxMessageSize
Get-SendConnector | Select-Object name,MaxMessageSize
Get-Mailbox -ResultSize unlimited | Select-Object name,MaxSendSize,MaxReceiveSize

Open in new window

1

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
servicadAuthor Commented:
Hi Jason Crawford,

Thanks for these!  The transport config is reflecting what was changed to 50MB.  The Receive and Send Connectors are showing 20MB so this is where the issue relies.  I know how to modify the send connector but cannot find the settings in the EMC to modify the receive connector.

Thanks!
0
The Five Tenets of the Most Secure Backup

Data loss can hit a business in any number of ways. In reality, companies should expect to lose data at some point. The challenge is having a plan to recover from such an event.

Jason CrawfordTransport NinjaCommented:
If you want to modify all ReceiveConnectors, do this:

Get-ReceiveConnector | Set-ReceiveConnector -MaxMessageSize 50MB

Open in new window

If you want to modify only one Receive Connector, do this:

Set-ReceiveConnector '<Receive Connector Name>' -MaxMessageSize 50MB

Open in new window

I don't know how to modify the setting in EMC either :)
0
Jason CrawfordTransport NinjaCommented:
Nevermind here it is:

Untitled.png
1
servicadAuthor Commented:
Thanks, Jason! I've made these modifications and am currently testing.
0
Mal OsborneAlpha GeekCommented:
Atachements are usually UU  or Mime encoded. This allows 8 bit data to be transmitted over systems that only handle 7 bit data, at at the expense of bloating files sizes. Also, sometimes base2 kbytes are used, sometimes base10 Kbytes. Thus, 50MB may be either 50000000 bytes or 52428800. Also, there is some space used by the message body itself, as well as added on headers.

Add all these factors, and it is common for an 8Mb attachment to be bounced by a server configured with a limit at 10Mb.
0
timgreen7077Exchange EngineerCommented:
Enough information provided for user to make needed changes.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Chat / IM

From novice to tech pro — start learning today.