Hi

Could you tell me if should I get access to Edge Server from Internet using telnet:

telnet mail.domain.pl 25

Edge Server is behind Cisco ASA Firewall. I'm not sure If is better to get acccess or not. I'm not sure if firewall rules on ASA are good created.

In DMZ network where is Edge server I can access using telnet command.

Thank you in advance for reply.

Hi, I think you shoud have access to the Edge server from internet in order to allow a correct mail flow with SMTP protocol.

So I think you shoud have a SMTP rule in place in your ASA firewall.

Kind Regards

Raffaele

• Proposed as answer by Mike CrowleyMVP, Moderator Friday, May 23, 2014 4:42 PM
• Marked as answer by cara chenMicrosoft contingent staff, Moderator Monday, June 02, 2014 8:39 AM

Hi

This may also be of interest, I have seen this many times with ASAs and SMTP: http://www.petenetlive.com/KB/Article/0000536.htm

Steve

• Marked as answer by cara chenMicrosoft contingent staff, Moderator Monday, June 02, 2014 8:39 AM

Hi

Yes. It was caused by ESMTP Inspection on Cisco ASA.

Thank you very much for help!