I have an internal domain named domainname.com . Recently we had some issues with the email delivery to certain people
#550 No RDNS/PTR entry for 60.A.B.C. ##
After contacting my ISP a reverse DNS for ip 60.A.B.C resolving to mailserver.domainname.com was created.
I told the ISP that we do not own the domain "domainname" so any reverse dns query will not be resolved to that domain name.
I was told the ptr record must resolve to something .
What are my options now ?
Now let say i own a domain say externaldomain.com and i change the internal domain name to externaldomain.com.
Will this address the situation?
I have read its not a good practice to name your internal domain as your external domain, if i can not name the external domain same as the internal domain, How will anything will be resolved to my internal domain.????