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Hi experts,
organization transport setting of max receive message size limits has been 30MB since exchange 2016 installation,
2 days ago, exchange 2016 mailbox receive message size limit of a user was increased from blank-setting to 100MB,
but now the user still can't receive message with size of 33MB.
is it true that user mailbox size limit takes precedence over all other max receive message size limits?
if so, why he user still can't receive message of 33MB that is smaller than user's mailbox limit 100MB?
what other limits or restart exchange services need to do ?
how to allow a special user receive messages larger than the org standard/default limits?
Any suggestion would be greatly appreciated.
Thanks for your time
pingatwork
You want the user to receive 100MB messages from where? internal users or the internet?
Hi @Pingatwork ,
1.I agree with what udara said. The reason why the mail cannot be received is because it is larger than the organization limit. And if you have not made specific settings, the message is larger than the mail size that the default accept connector can received.
2.According to the part of “Order of precedence and placement of message size limes” in the link provide by udara, we could know that “Recipient limits between authenticated senders and recipients (typically, internal message senders and recipients) are exempt from the organizational message size restrictions. You can allow specific mailboxes to send and receive larger messages than the rest of the organization by configuring custom send and receive limits for those mailboxes.For messages sent between anonymous senders and recipients (typically, Internet senders or Internet recipients), the organizational limits apply".
3.So if you receive the 50MB email from the internet, you could increase all restrictions on mail size in the Exchange organization. And it should be noted that for any message size limit, you need to set a value that's larger than the actual size you want enforced. This accounts for the Base64 encoding of attachments and other binary data. Base64 encoding increases the size of the message by approximately 33%, so the value you specify should be approximately 33% larger than the actual message size you want enforced.
4.According to Microsoft’s official recommendations, in order to avoid wasting system resources, it is recommended that you keep the same limits for all locations.
For more information you could refer to the link provide by udara.
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Hi LucasLiu,
totally agree with you, now I realized the mailbox message size limits only can bypass other limits for internal senders only.
For Server limits - Maximum size for a message sent by Exchange ActiveSync clients ; Maximum size for a message sent by Outlook on the web clients, since all these are the MAX for sending , can I ignore them if my goal is to allow receiving larger emails?
If so, i will not make any changes to Server Limits and limits of the user mailboxes, only working on the organizational limits and connectors limits. and organizational limits are just 2 settings I have changed to 100 MB, and last question is how to use connectors limits to achieve allowing a few users receive 60 MB email but reject larger email for most of other users.
not sure if my assumption is correct, what would you suggest ?
thanks for your help
pingatwork
Hi @Pingatwork ,
In your case, I recommend you to increase the mail size limit of the receive connector, then you could create a transport rule to reject mail larger than 60MB except for specific recipients (Note that as mentioned above, the value of this setting needs to be larger than the actual size).
For more information you could refer to: Mail flow rules in Exchange Server
Screenshot below is my test in my lab, this transport rule means: The sender is outside the Exchange organization, and mails with a mail size larger than 50MB except for the specific recipient will be deleted. The specific recipient and mail size, please change according to your needs.
For the server limit, yes, it only limits the size of the sent mail, you don’t need to change it.
However, as for the mail size limit of user mailboxes, according to an official Microsoft article, Exchange will check the maximum message size that's allowed on mailboxes before mail flow rules process messages, so you also need to change the mail size limit of a specific user's mailbox.
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Hi LucasLiu,
yes, the method you suggested probably the best configuration for the issue. mail size limits of all receive connectors increased to 100MB, transport rule to reject mail larger for other users except a few selected users, and the mail size limits of selected users' mailbox are increased to 100 MB.
At first i was trying to create a new receive connector for larger mail size limits, but that was not flexible to cover all potential sender domain IP ranges. yours suggestion is the best so far. Many thanks Lucasliu.
Regards,
pingatwork
Hi @Pingatwork ,
I am glad to hear that the methods provided above are helpful to you.
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Reason is the "organization transport setting of max receive message size limits has been 30MB"
Increase this value more than 33MB.
you can refer following for further details of message size limitation,
https://learn.microsoft.com/en-us/exchange/mail-flow/message-size-limits?view=exchserver-2019
Hi udara, Thank you so much for answering my questions, and the useful link. I am studying it ...
Hi udara, I realized the mailbox message size limits only can bypass other limits for internal senders, not for external senders.
My purpose is to allow only a few users to be able to receive(not for sending) larger 60 MB email from external senders, but most of rest of users are limited to 30 MB.
understand that message limits are available at the 4 levels and the most restrictive limit is enforced:
Hi AndyDavid,
to receive from the Internet.