> 4. SPF and Internationalized Mail
> [...]
> SPF macros %{s} and %{l} expand the local part of the sender's
> mailbox. If the local part contains non-ASCII characters, terms that
> include %{s} or %{l} do not match anything, because non-ASCII local
> parts cannot be used as the DNS labels the macros are intended to
> match. Since these macros are rarely used, this is unlikely to be an
> issue in practice.
Wouldn't it be better to suggest the possibility of doing the right
thing in that situation? Perhaps:
If the local part contains non-ASCII characters, terms that include %{s}
or %{l} MAY not match anything but SHOULD match, because non-ASCII local
parts cannot be used as the DNS labels the macros are intended to match.
A standard for internationalized mail perhaps should have support for
internationalized local postmaster addresses, even if weak.
--
Spenser Truex
https://spensertruex.com/
San Francisco, USA
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