Increasing Exchange Message Size Limits to a specific mailbox-user

Dear Experts,

I have an Exchange 2010 Standard.

To best of my knowledge I can increase the Global send and receive limits at Organization Level.
This will lead all users to send and receive messages to the new limits.

Q1) At this point do I also need to change Send and Receive Connectors Limit?
Q2) If it is not required, when should I change the limits on the connectors?

I have also found from the Internet that increasing the limits on a specific mailbox-user higher than the limits
set at Organization/Sent Connector/Receive Connetor this setting will override those limits
for messages that are being sent internally only.

Q3) Assuming that the Organization Level limit is 10MB and an individual mailbox-user limit is 25MB,
is it possible that individual user to send and receive 25MB messages internally and externally?
Q4) If its possible what settings are required?

Thanks for your support,
Mamelas
mamelasAsked:
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Jonathan BriteSystem AdminCommented:
Open Exchange Management console

recipient configuration>mailbox>right click user mailbox>mail flow settings>Message Size Restrictions>properties
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Helao MwapangashaData Centre: Server EngineerCommented:
Q1) At this point do I also need to change Send and Receive Connectors Limit?
Yes you do

Q2) If it is not required, when should I change the limits on the connectors?
you change limit on the connectors to make sure messages pass through at the allowed size

I have also found from the Internet that increasing the limits on a specific mailbox-user higher than the limits
set at Organization/Sent Connector/Receive Connector this setting will override those limits
for messages that are being sent internally only.

Q3) Assuming that the Organization Level limit is 10MB and an individual mailbox-user limit is 25MB,
is it possible that individual user to send and receive 25MB messages internally and externally?
no, if you want them to be able to do so then you set the send or receive connectors to allow messages of 25MB  but you set the organizational global limits to 10MB. This means all users are caped at 10MB on the mailbox level. You then set the specific user to 25MB on their mailbox. So this user alone will be able to send and receive messages larger then the global limit.

Q4) If its possible what settings are required?
Answer in the answer to question 3
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mamelasAuthor Commented:
Dear Helao,

Q1 and Q2 are noted.

Regarding Q3 I have found from this site the below:
If you set an individual maximum send or receive size setting higher than the organization or connector limits, the individual setting will override those limits when the message is send internally, e.g the recipient resides in the same organization. This way you can create exceptions for certain individuals which require a higher message size limit.

If the above is correct, with Organizational limits to 10MB, Connectors at 25MB and User mailbox at 25MB this will allow user to send internal messages of 25MB but messages sent through internet will be limited at 10MB.

So does Exchange support specific users to send messages externally with different limits?
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Helao MwapangashaData Centre: Server EngineerCommented:
I would try and prove that article. Exchange has a receive connector for internal and external emails.

have a look here

http://www.msexchange.org/articles-tutorials/exchange-server-2010/management-administration/managing-limits-exchange-server-2010-part3.html
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mamelasAuthor Commented:
Dear Helo,

I would like to thank you since the above link helped me a lot.

I have found at least two possible solutions for subject question.

Both solutions require Organization Send/Receive limit as well as Send/Receive Connectors to have same size otherwise it may cause message failures.

Then one choice which is easy and quick for small organizations is to set for example Organization Unit to 25MB, Connectors to 25MB and change the mailbox limit for each user to 25MB or less.

The second choice which is easily scalable and reversible is to create a Transport Rule.
In this case a Distribution Group should be created for the members that are allowed to send/receive 25mb messages and then this Group should be excluded from the Transport Rule that would restrict all users to send/receive messages bigger than 10MB.
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Helao MwapangashaData Centre: Server EngineerCommented:
hi mamelas

i am glad u managed.
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