Hi guys, I'm having some issues lately with users getting their smartphones infected anse sending a lot of spam to external addresses via our exchange system. This leads to blacklisting and mass hysteria... Our antispam system (fortimail) doesn't have a subsmission rate control and MS applies the native one only to SMTP submission it seems.
What do you do to prevent that kind of trouble? I cannot control user's devices, we let them use their own.
PS
Lowering the recipient rate could help but could backfire (prevent legit emails) while spam softwares could easily send more mails with less recipients to avoid being blocked.
Bye, Dario
Dario Palermo