Increase the attachment's size in Exchange 2016

Dear guys, we have an Exchange 2016 on-premise server and would like to increase the attachment's size of users' emails to 100 MB. We did some research and followed but still got the error "The following files weren't attached because adding them would cause the message to exceed the maximum size limit of 25 MB: smex_12.0_ag.pdf. " when attached a file that is bigger than 25 MB into an email. Could you please suggest?


Attached pictures are our settings, we restarted IIS, Transport services, even server itself but did not help!
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TjnoNetwork AdministratorAsked:
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John TsioumprisSoftware & Systems EngineerCommented:
Have you checked if your Transport is limiting you....check the Ms guideline
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Scott CSenior Systems EnginerCommented:
Take a look at these two links, the first article is from MS and the blog is from CodeTwo.

These should tell you what you need and how to increase it.

https://technet.microsoft.com/en-us/library/bb124345(v=exchg.160).aspx

https://www.codetwo.com/admins-blog/exchange-attachment-size-limit-find-change/
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SeanSystem EngineerCommented:
While you can change this on the transport I'll tell you if you send outside of the org they will get blocked. Usually most email servers will not accept most messages that are larger than 25-30 mb in size. But again if you are receiving that large email or doing so internally that will be just fine.

get-transportconfig | Set-TransportConfig -MaxSendSize 100MB -MaxReceiveSize 100MB
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TjnoNetwork AdministratorAuthor Commented:
Did you see my attached pics, I followed your links before asking this question, but did not help
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Pete LongTechnical ConsultantCommented:
Come on guys, instead of trying to be first to post, read the question :(

You look to be setup correctly, and as you have bounced the server the AppPools will have been restarted/recycled (just in case people are still Googling!)

I'm assuming this is a stand alone server? If you open the web.config files (one for EWS and One for OWA) do they match the settings the connecters are telling you they are using in the Shell?

locations
%ExchangeInstallPath%ClientAccess\exchweb\ews\web.config
%ExchangeInstallPath%ClientAccess\exchweb\owa\web.config
or it might be
%ExchangeInstallPath%ClientAccess\owa\web.config - I dont have access to one to check at them moment.

Also make sure nothing is doing ESMTP inspection between the clients and the Exchange server, (again assuming you are on the same LAN and not connected via https)


Pete
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Pete LongTechnical ConsultantCommented:
Actually if you are connected via HTTPS then see this article, notice the Active-Sync size limits are defined differently!

P
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TjnoNetwork AdministratorAuthor Commented:
@Peter: Thank you very much, it worked perfectly :)

@others: please read the question before answering, become first post is not guaranteed 1000 points!
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Pete LongTechnical ConsultantCommented:
13L@CK_H@3RT

Cheers, to add a little more weight to the question, I wrote this today.
Exchange : ‘Message Exceeded The Maximum Size Limit’

Regards'
Pete
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