email bounce back with error loops back to myself

[mkamal]

Hello
i had use EFA as Spam filter 3.0.1.8 in front of exchange for incoming email filtering for more than 4 month and it working great but from 2 day ago i change setting to make it scan inbound and outbound work for 2 day after normall without problem but today i face the below error
any email send to outside back to user with error
error bounced (mail for gmail.com loops back to myself)

maillog
warning: host mx1.norelay.link.net[127.0.0.4]:25 greeted me with my own hostname myserver.mydomain.com
myserverpostfix/smtp[45057]: warning: host mx1.norelay.link.net[127.0.0.4]:25 replied to HELO/EHLO with my own hostname myserver.mydomain.com
relay=mx1.norelay.link.net[127.0.0.4]:25, delay=30, delays=30/0/0.02/0, dsn=5.4.6, status=bounced (mail for gmail.com loops back to myself)

Kindly Advice

[shawniverson]

Your Exchange and EFA have the same FQDN in the HELO?

[mkamal]

No They Use Different name
telnet efa response to helo or ehlo from it FQDN Mailfilter.mydomain.com
telnet exchange response to helo or ehlo from it FQDN mail.mydomain.com


exchange send connector use mail.mydomain.com in ehlo - helo
EFA setting is check hostname is Mailfilter.mydomain.com Kindly Advice is where file or configuration contain the FQDN that response to ehlo or helo

[shawniverson]

Look in /etc/postfix/main.cf for EHLO string