Set maximum email message size for outbound messages

To set maximum email message size for outbound messages for an individual user do the following:

#First check the current size limit:
get-mailbox "user" | select MaxSendSize
#Then set the prefered size limit:
set-mailbox "user" -MaxSendSize XXMB
#To set the size limit for all mailboxes run:
Get-Mailbox | Set-Mailbox -MaxSendSize XXMB
#To set the size limit for a list of mailboxes first create a list with the mailbox names and then run:
Import-Csv C:tempmalboxes.csv|%{Set-Mailbox -Identity $_.mailbox -MaxSendSize XXMB}

 

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