We have an Exchange 2010 server with about 10 iphones. Recently we have been having spammers send email to our network bypassing our mail filter. We can setup a rule on our firewall that prohibits smtp connections but that would break our iphone users.
I was wondering if other people have had this issue and waht they have done to get around it. Hopefully what I wrote makes sense.
Please let me know if I am mistaken about how Iphones send out.