I wrote:
Matter of opinion. Mine is that SMTPUTF8 is enough. Mutt
doesn't carry out a server compliance test, it just sends mail,
so it should check the extension it wants to use. Checking other
extensions that are/may be implicitly used is a digression.
Let me elaborate on that.
Mutt uses a server extension, so it should check the presence of the
extension it wants to use. But after that, IMO it should assume that the
server complies with the relevant RFC requirements. Mutt could easily check
whether the server complies with one of the requirements, and would need to
make much more effort to check the others. But because mutt isn't a
compliance test, both the simple check and the more complex checks would be
digressions from mutt's purpose.
Arnt
