Why does the server appear to be not its own address?

Question

SMTP

Header from the letter
Received: from dnsmm.ru ([78.108.90.220]:33016 helo=vm20691.majordomo.ru)
As far as I remember, such a glitch happens because of ptr
-------------Determine IP site address dnsmm.ru: 78.108.90.220------------------
PTR record for 78.108.90.220:
220.90.108.78.in-addr.arpa IN PTR dnsmm.ru
can host glitch? or dns response? or?

Answer 1

Most likely, your hostname on the server is exactly that.