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Exchange Online Modify Max Attachment file size

Posted on 2016-07-22
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Last Modified: 2016-09-11
I want to modify the Maximum attachment size. The EOL default 10 MB. However, I do not see the -InternalDsnMaxMessageAttachSize parameter in Set-Transportconfig. What PS add-on is needed for this?
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Question by:K Anthony O365
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Accepted Solution

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Ivan earned 250 total points
ID: 41724819
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Author Comment

by:K Anthony O365
ID: 41724820
My PS version is 4.0
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LVL 41

Expert Comment

by:Vasil Michev (MVP)
ID: 41724837
Attachment limit is 150MB in EO, but that also depends on the client. You cannot increase it past that limit. Info is here: https://technet.microsoft.com/en-us/library/exchange-online-limits.aspx#MessageLimits

InternalDsnMaxMessageAttachSize is different, it only relates to NDR messages.
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Author Comment

by:K Anthony O365
ID: 41724859
Ivan,

Unfortunately, this doesn't help with Attachments.
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Author Comment

by:K Anthony O365
ID: 41724865
We have Plan 3 (E3) license. Therefore we should be able to increase it to 150 MB, but PS is not showing the parameter.
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LVL 41

Expert Comment

by:Vasil Michev (MVP)
ID: 41725006
Again, the default is 150MB. The parameter you are trying to set only affects NDR messages.
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Author Comment

by:K Anthony O365
ID: 41725015
Understood. But is it possible to change the Attachment size on EOL, or am I limited to 10 MB?
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LVL 41

Expert Comment

by:Vasil Michev (MVP)
ID: 41725106
Seems we're speaking different languages here, the defaults are now 150MB. You can check via:

Get-Mailbox | ft Name,Max*Size

Open in new window


As noted above, client/protocol limits apply and might reduce this.

To set the limits, use:

Set-Mailbox vasil -MaxSendSize 150MB -MaxReceiveSize 150MB

Open in new window

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Author Comment

by:K Anthony O365
ID: 41725113
Sorry for the confusion. I'm able to modify the MaxReceive and MaxSend sizes. It's the Attachment. (Attachments) The parameter  you show only affects the message size, not Attachments.
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LVL 41

Assisted Solution

by:Vasil Michev (MVP)
Vasil Michev (MVP) earned 250 total points
ID: 41725214
You can have 150MB attachment, it's only limited by the message size (well and the MIME bloat, so technically 112MB only). I posted the "limits" article above, you can find the details there.

Whether the client will actually allow you to attach such large files is another story.
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Author Comment

by:K Anthony O365
ID: 41737345
You are correct. Thank you!
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Author Closing Comment

by:K Anthony O365
ID: 41793275
this was helpful. thanks again
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