Some Domain not accept message from Cisco ESA

[Ahmed Hassabo]

The ESA Setup to Filter inbound and outbound mail
I face problem with specific Domain when I try to Send Mail from My local Domain to this External Domain .. I received alot of soft Bounce when I try to Send message to (X ,Z) Domian  
Error Message : DCID 1003) Message 14261 to X Domain delayed. Reason: 4.4.0 - Other network problem ('000', ['[Errno 54] Connection reset by peer']) [] 29 Aug 2017 14:52:38 (GMT +02:00) Message 14261 to Fax@X.com pending until Tue Aug 29 15:20:53 2017 as per bounce profile Default..

Note:before install the ESA the Message Flow is normal the problem occurred after install the ESA 

i attach message tracking detalis for one message as example 

My Internal Domain End with .com 

the domian that i try to send message to them end with -fld.com

the ESA setup with one ip address for sending and receving 

[dmccabej]

Hello,

Have you tried manually connecting to the receiving host in question via telnet on the ESA? It looks like they may be blocking/restricting you, or there may be some other sort of network related issue going on.

telnet 41.33.x.x 25

If you're still seeing these errors, I would recommend running a packet capture and then trying to perform some manual telnet tests as a next step. If you can, I'd run the packet capture simultaneously on the edge device as well as the ESA to gather as much data possible. 

Thanks!

-Dennis M.