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RFC 2821: From Section 5 of RFC 2821.Currently, If an MX query fails...

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Comment by Slacker
Submitted on 5/28/2005
Related RFC: RFC 2821
Rating: Not yet rated	Rate this comment:
From Section 5 of RFC 2821.Currently, If an MX query fails then an A record is queried to find a mail server. In my opinion, this will only lead to trouble. In most cases, this will lead to email being sent to a webserver since it has that address. If the webserver also happens to be running an SMTP server on the same IP, a misleading message will be generated, most likely along the lines of unable to relay. This situation has happened to me a few times and the other mail server admin tells me that my server is generating that message which I confirmed was incorrect after reviewing SMTP logs.