550 “REJECTED – Bad HELO – Host impersonating
If you found this error for any particular domain say unixsurgeon.com, then first check the mx record for this domain. If the MX record is pointing to a different server, then just remove the domain entry unixsurgeon.com from the /etc/localdomains, And add the same entry in /etc/remotedomains. After that restart the exim service.
[root@p-root]# /etc/init.d/exim stop
[root@p-root]# /etc/init.d/exim start
It will solve your problem. And Other option is find the following line in exim.conf and comment it.
[root@p-root]# vi /etc/exim.conf
drop
condition = ${if match{$sender_helo_name}{$primary_hostname}}
message = “REJECTED – Bad HELO – Host impersonating [$sender_helo_name]“
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Enjoy Linux !!!
