Solution:
Open exchange management shell
-----
update send sizes
get-sendconnector | select identity,maxmessagesize
set-sendconnector \"connector name listed above\" -maxmessagesize 30MB
Check the size to see if it worked.
get-sendconnector | select identity,maxmessagesize
------
update receive sizes
get-receiveconnector | select identity,maxmessagesize
set-receiveconnector \"connector name listed above\" -maxmessagesize 30MB
Check the size to see if it worked.
get-receiveconnector | select identity,maxmessagesize
|