ASA 5516 turn off mailguard feature

[mohamed.fawzy2012]

Dears ,

i installed exchange server behind asa and there is a problem that users cann't send any mail to specific domains hosted in specific ISP

, ISP said that the solution is to turn off mailguard feature in firewall 

my question is if this recommended to turn off this feature as may after that my network will be vulnerable to mailcious user or attacks

BR,

mohamed

[patoberli]

That might be the ESMTP inspection which is making trouble for you, check: http://www.cisco.com/c/en/us/support/docs/security/asa-5500-x-series-next-generation-firewalls/113069-asa-disgi-enai-asdm-00.html

I recommend to completely disable the SMTP or ESMTP inspection.