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Re: MX to CNAME and (mis)interptretation of 2821

2007-12-12 17:15:28

At 3:33 pm -0700 12/12/2007, Trevor Paquette wrote:
According to RFC 2181, this is invalid. You cannot have an MX record that resolves to a CNAME.

Section 2.4 of RFC 1912 also says "Don't use CNAMEs in combination with RRs which point to other names like MX, CNAME, PTR and NS."

However, in talking to TrendMicro, they say that this syntax is perfectly valid and that RFC 2821 overrides the MX to CNAME limitation.

Nowhere in RFC 2821 does it say that it obsoletes or updates RFC 1034 or 2181.