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What DNS lookup does an SMTP server do when delivering to user@mail.domain.com?

• If I send an email addressed to user@mail.domain.com, should the outbound SMTP server try to connect based on an A record for "mail" in the domain "domain.com", or should it do a lookup for the MX record in the domain "mail.domain.com"?

• Answer:

  Hi, It is a common mistake to believe a MX record is nessessary for mail delivery. In the absensce of a MX record, mail to mymail@mail.domain.com will be sent (and handled by) the mail.domain.com server. So if you only have one server, say domain.com and your address is myaddress@domain.com, you don't really need a MX record setup at all. The reason for MX records is to be able to specify that your mail is going to be handled by another server, and not domain.com. This comes in very handy for larger websites and servers. Reference links support.DynDNS.org http://support.dyndns.org/whitepapers/mail.php Preparing for Installations Setting up MX records https://support.openwave.com/post_office/docs/PO/SOSv35/po35-02D.html MX-Records http://www.jhsoft.com/help/rec_MX.htm Useful Search Query on Google MX Records Thanks, webadept-ga