I am managing an Exchange Server 2013 with out any 3rd party spam- and malware software and I am receiving alot of spam, between 20 and 30 emails very day.
I have configured antispam and antimalware on my Exchanger server by following guides like
http://www.msexchange.org/articles-tutorials/exchange-server-2013/security-message-hygiene/anti-spam-and-anti-malware-protection-exchange-2013-part1.html
and
https://technet.microsoft.com/en-us/library/bb201691(v=exchg.160).aspx
Most messages have the same subject text and some are different. Most messages come from different email addresses.
Most of the messages also have a .zip, .doc or .jpg file attached. I have configured malware agent to reject such files, to scan inside the files but they still end up in the mailboxes.
Any cloes to stop the spam and malware?