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joeforker
Asked: 2010-01-27 13:37:05 +0800 CST

Is it standard to try to send mail to the A DNS record if there is no MX record?

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Our systems cannot send e-mail to a company that has no MX record. There is an SMTP server running on their IP address and they are able to get e-mail from gmail. Is it normal for mail systems to try to connect to a SMTP server at the A record when there is no MX?

domain-name-system email

2 Answers

  1. Best Answer

    Yes it is standard, per RFC 5321. Please see the Wikipedia page on MX Records

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  2. Normally yes, if no MX record exists, the A record should be used as a failsafe.

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