This is how external dns zone look like , it's static set on namecheap.com:
I have set two A records to my local ip address
A isp1 192.168.1.250
A mail 192.168.1.250
I also set 2 CNAME records
isp1 mylocal.dyndnsname.com
mail mylocal.dyndnsname.com
and ofcourse MX record
@ isp1.mydomainname.com
isp1 is hostname, fqdn hostname is isp1.mydomainname.com
I didn't touched internal dns zone inside ISPmanager.
Hope there is way for exim to make it work, it may also be good idea to check if clear installation of exim under centos7 supports email delivery this way.
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