Hi all

i'm trying to get this:

when message arrive,  compute total size = (attachment size * recipient count),

when total size larger than 5G, save attachment to file server, delete attachment from message, and add file access links in file server to message body.

is possible to do that? can i develop custom transport rule or action, to excute the delete and save attachment file processes?(use C#,or C++...)

Transport rule cannot do that. You need to develop a custom transport agent.

https://msdn.microsoft.com/en-us/library/office/dd877026(v=exchg.150).aspx

Hi humorimp,

Base on my knowledge, I don't think there are any transport rules can achieve your requirement.

However, I recommend you post this in Exchange development forum ,you may get some workarounds to help you.

Best regards,