limit messages weight

If you send a large attachment to someone,
it may not go through as their incoming attachment size may be smaller.

The “limit message weight” option lets you define a maximum message weight
so that they will be blocked even before uploading them.

The sending of overweight attachments is stopped,
the email gets bounced back immediately to the sender,
with a warning like:

The message you are trying to send exceeds 
the global size limit of (xxxx bytes) of the server, 
reduce the size of the message and attempt to send again.