On 2013-06-01 1:40 PM, Bill Cole wrote:
It is altogether always wrong for ANY mail software outside of a domain
to parse the local part of an address in that domain except for a tiny
handful of standard special local parts (e.g. "postmaster").

On it's own, I agree.

The use of '+' as a tag delimiter is widespread but it is not in any
sense a "standard" and comes nowhere near universality. There is no
way for a Mailman instance to know which domains make "user+tag" and
"user" equivalent and which do not, so canonicalizing as you suggest
would result in breakage.

Currently factually and technically correct, But...

There is no reason that Mailman couldn't be enhanced with a configurable *option* that would allow the domain Admin to *tell* it which character(s) (there was recent talk on the postfix list of postfix being enhanced to allow multiple characters to be defined as this delimiter) were to be used as delimiters.

I would love to see this ability in MM3...
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