Meng Weng Wong wrote:
Continuing the tradition:
If the <target-name> has no MX records, SPF clients pretend the
target is its single MX, and perform an A lookup on the
<target-name> directly. This behaviour follows generally accepted
email practices.
Breaking with tradition:
If the <target-name> has no MX records, SPF clients MUST NOT
pretend the target is its single MX, and MUST NOT default to an A
lookup on the <target-name> directly. If such behaviour was
intended, the <target-name> would have specified an "a"
declaration instead.
Which do you think would be better, guys?
I'd suggest breaking with tradition, as tradition is wrong, IMO.
---
Dustin D. Trammell
Vulnerability Remediation Alchemist
Citadel Security Software, Inc.
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