efa-project.org

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iam going To my cloud server what installed with Efa-project , >> then i added Smarthost in outbound Smarthost my company email A Record
mail.mycompany.com and its well linked to dns

but when i tring to send message from my exchange server inside my company , and then arrive to Cloud Efa project server

this error message
look the ip 51.235.10.143 look its unknown so that reason i think not accept it even if i already insert it in smarthost ! ,

iam sure in dns there are record [ A ] for this ip 51.235.10.143 linked to mail.mycompany.com so why postfix fail to resolve it ???

We use EFA as an inbound mail filter, so I am not familiar with it's configuration as a smarthost. That said we have used smarthosts before.

Have you configured EFA to relay email for your authorized domain. By default EFA processes email only for authorized domains.

you need to add the sending server to mynetworks in postfix main.cf, however I believe that it only accepts IP addresses, not hostnames, so you might need to write a script that updates the mynetworks section every time it detects a change in IP address for your host.
http://www.postfix.org/BASIC_CONFIGURA ... relay_from

The other option is to enable smtp authentication and allow relay from all authenticated clients.
See the part of the document linked above "This is explained in the SASL_README and TLS_README documents".