On Tue, 17 Dec 2024, Gellner, Oliver via mailop wrote:
The only validators which I found that correctly reported a problem
are Mailhardener ("The selector 'init_dkim' contains an underscore,
some SMTP implementations will not accept a DKIM selector with
underscores. If possible, choose a different selector without
underscore") and Uriports ("The provided DKIM selector is invalid").
Is underscore forbidden or merely not supported by some implementations ?
My reading of RFC6376 doesn't suggest that underscore is not allowed in a
selector and they are explicitly used in next component of the DNS query.
If my reading is correct and underscores *are* permitted,
a validator should not object to them, though like Mailhardener
it is reasonable to warn that non-compliant implementations may break.
Also, Uriports is wrong to say that the selector is invalid.
--
Andrew C. Aitchison Kendal, UK
and...@aitchison.me.uk
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