Phil White wrote:
The converse question is: Is there any reason why a dash could not be
substituted for the underscore? What is the (realistic) risk of a
collision?
Is there any reason why SPF cannot use this method instead?
If you completely translate the subdomain to use dashes, you get
"-smtp-client". I believe that has a very low risk of collision.
However, that being said, I think something like "-spf" may be a better
option, or "-spf-conf".
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Dustin D. Trammell
Vulnerability Remediation Alchemist
Citadel Security Software, Inc.
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