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DNS setup - is having no A records OK?

     
2:18 pm on May 3, 2010 (gmt 0)

Senior Member from CA 

WebmasterWorld Senior Member encyclo is a WebmasterWorld Top Contributor of All Time 10+ Year Member

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Rather than trawling through the RFCs, I thought I'd be lazy and ask here instead. ;)

I have a domain for which the primary purpose is to catch typos for an important email address - there's no associated website. I set up the DNS with the usual SOA record, two NS and 7 MX records (plus a CNAME for validating with Google Apps).

Do I actually have to add an A record to the DNS, or is just having MX records valid?
2:45 pm on May 3, 2010 (gmt 0)

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WebmasterWorld Senior Member lammert is a WebmasterWorld Top Contributor of All Time 10+ Year Member Top Contributors Of The Month

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Mail servers will first query the DNS server for MX records. Only if no MX records are found, they will fall back to A records. [tools.ietf.org...] section 5.1.

A records for SMTP servers are deprecated anyway and are only still supported for compatibility with older setups.

catching email typos, ahum...