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"+" is valid in the left-hand side portion and Postfix uses it (by default) as the separator to provide this feature but other mail systems (Qmail and, IIRC, Co
by jlgaddis 13y ago
"+" is valid in the left-hand side portion and Postfix uses it (by default) as the separator to provide this feature but other mail systems (Qmail and, IIRC, Courier) use "-".
That functionality is not an RFC requirement, however.