I know it is possible to use a service such as mxtoolbox.com to query a domain for its records, e.g. MX and A.
Is it possible to do the reverse and search for all the domains that share the same record? For instance, example.com and example2.com both have an MX record pointing to mail.example3.com. Is there a way to search public DNS for mail.example3.com and get example.com and example2.com as results?
If it can't be done is it due to security/ privacy or a technological limitation of DNS?