Roberto Alsina wrote:
> what's one supposed to do on the mail server if a client uses
> that kind of HELO? Not important, but I am a curious guy :-)
As far as SPF is concerned a:%{h} after HELO [127.2.3.4] doesn't
match because domain literals don't have A-records - same idea
as for HELO oemcomputer
For a "receiver policy" unrelated to SPF you could decree that
you're willing to talk with "HELO [127.2.3.4]" if the client IP
actually is 127.2.3.4 because domain literals are allowed in
SMTP. But you could refuse to talk with it if the IP differs.
Your question inspired me to new (maybe) test case proposals:
HELO museum and HELO museum. (with a trailing dot)
Both are SMTP syntax errors (2821 or 2821bis alike), but of
course receivers are free to accept it anyway like oemcomputer.
For an SPF policy using a:%{h} the mechanism should match for
IP 195.7.77.17 - please correct me if that's wrong.
For the test suite s/museum/test/ or similar.
Frank
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> what's one supposed to do on the mail server if a client uses
> that kind of HELO? Not important, but I am a curious guy :-)
As far as SPF is concerned a:%{h} after HELO [127.2.3.4] doesn't
match because domain literals don't have A-records - same idea
as for HELO oemcomputer
For a "receiver policy" unrelated to SPF you could decree that
you're willing to talk with "HELO [127.2.3.4]" if the client IP
actually is 127.2.3.4 because domain literals are allowed in
SMTP. But you could refuse to talk with it if the IP differs.
Your question inspired me to new (maybe) test case proposals:
HELO museum and HELO museum. (with a trailing dot)
Both are SMTP syntax errors (2821 or 2821bis alike), but of
course receivers are free to accept it anyway like oemcomputer.
For an SPF policy using a:%{h} the mechanism should match for
IP 195.7.77.17 - please correct me if that's wrong.
For the test suite s/museum/test/ or similar.
Frank
-------
To unsubscribe, change your address, or temporarily deactivate your subscription,
please go to http://v2.listbox.com/member/?list_id=1007