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Re: zmailer too restrictive
The catch-22 is that in order to identify the local-part (the thing
it's not supposed to mess with when the domain is not the local
host), zmailer has to parse the From: line, as specified in the
BNF on Appendix D of RFC822, as modified by RFC1123.
Which includes parsing the local-part for syntactic correctness,
even if not for validity.
This is why there is a specification for the local-part, and why,
when certain characters occurr in the local-part, it MUST be quoted.