https://community.cisco.com/t5/network-security/asa-5516-turn-off-mailguard-feature/m-p/2923413#M167848 <P>Dears ,</P> <P></P> <P>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</P> <P>, ISP said that the solution is to turn off mailguard feature in firewall&nbsp;</P> <P></P> <P>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</P> <P></P> <P>BR,</P> <P>mohamed</P> Tue, 12 Mar 2019 07:25:13 GMT mohamed.fawzy2012 2019-03-12T07:25:13Z https://community.cisco.com/t5/network-security/asa-5516-turn-off-mailguard-feature/m-p/2923413#M167848 <P>Dears ,</P> <P></P> <P>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</P> <P>, ISP said that the solution is to turn off mailguard feature in firewall&nbsp;</P> <P></P> <P>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</P> <P></P> <P>BR,</P> <P>mohamed</P> Tue, 12 Mar 2019 07:25:13 GMT https://community.cisco.com/t5/network-security/asa-5516-turn-off-mailguard-feature/m-p/2923413#M167848 mohamed.fawzy2012 2019-03-12T07:25:13Z https://community.cisco.com/t5/network-security/asa-5516-turn-off-mailguard-feature/m-p/2923414#M167849 <P>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</P> <P>I recommend to completely disable the SMTP or ESMTP inspection.</P> Mon, 29 Feb 2016 13:12:16 GMT https://community.cisco.com/t5/network-security/asa-5516-turn-off-mailguard-feature/m-p/2923414#M167849 patoberli 2016-02-29T13:12:16Z