Date:        Tue, 04 May 2021 16:58:43 +0300
    From:        Greg Minshall <[email protected]>
    Message-ID:  <[email protected]>

  | Eric Allman had already written sendmail, i think,

Yes.   And delivermail before that.

  | which presumably parsed.

Not really.   It was able to extract the operational part
of the address (so it could be rewritten), but did not care a
lot beyond that - it had to cope with mail from all different
kinds of systems, after all.   No guarantee of rfc822 formatting.

kre


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