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by frankwiles 1565 days ago
Yes, but not that well known. It’s part of the SMTP spec.
1 comments
TimWolla 1565 days ago
It's not part of the SMTP spec. SMTP treats the local part as an opaque identifier. It's somewhat common though and RFC 5233 extends the sieve filtering language to support it: https://datatracker.ietf.org/doc/html/rfc5233
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