update to newer emersion/go-smtp and go-sasl #4
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I wanted to pull in the latest version of go-smtp and go-sasl just to be sure I have all available bug fixes, if any.
This turned out to be quite the undertaking, because:
go-smtp-proxy
is no longer active, so I integrated it as a fork. Not sure if we should just rebuild the functionality into the backend, or if it makes sense to keep it as a separate layer — haven’t looked at it in much detail yet.I’m not sure if everything is right; would appreciate a review. I also included the commits of my other PR #3 for simplicity. Would you mind merging that one? I’ve been using it in production for years at this point.