Hi all,

I have Exchange server 2013 CU7, I want to limit number of recipients when my users send email to external/internet.
For example:
If my users send email to more than 50 external recipients once, they will receive error "bla bla"

Limitation is not apply when my users send email to internal recipients"
or external sender send email to internal recipients

How can I do it ? (which send connector , receive connector , transport config , transport service , transport server)

Thank for your help.

Jack

I don't know of anything that allow this natively on Exchange, you can limit with MaxRecipientEnvelopeLimit on the TransportConfig, but it won't make a difference between internal or external addresses.

You could however put that kind of limit on your outgoing messaging gateway, as the recipients envelop will only contains external addresses.