I am using a service for smtp relay and they give me a smtp server url (mail.theirdomain).. I wanted to ask if there is any way of "masking" this for example with some dns records to make the mail.theirdomain, mail.mydomain?
1 Answers
Sure, you can do a DNS lookup of mail.theirdomain.com and see what IP address this hostname points to (e.g. x.x.x.x). Then, you can create a hostname mail.mydomain.com, and point this hostname to the same IP address (x.x.x.x).
But, if you do a reverse DNS lookup (i.e. PTR lookup) of x.x.x.x, it will likely point to mail.theirdomain.com (not mail.mydomain.com), and you can't change this, because you do not have control of x.x.x.x.
Also, if you open an SMTP connection to mail.mydomain.com, it will likely show mail.theirdomain.com in the SMTP banner that the server responds with after a client connects - and this is not something that you can change either.
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