qpsmtpd
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Allow an alternate ID for Authentication-Results
When using a cluster of servers, it's sometimes needed to have the same ID in the Authentication-Results header, rather than just the hostname, and you don't always want to change "me" (because that has other effects). Allow an alternate "ar-me" config file.
The name me-auth-results does make sense, so I've changed that.
We also use qpsmtpd in internal-only hops that don't check SPF/DKIM/etc. and should not be adding/replacing Authentication-Results headers. So I expanded the meaning a bit to allow "none" to disable that.