Re: Eliding quotes in envelope? (Re: New spammer exploit ...)

[Scott Schwartz]

To make this more concrete, consider the following:

        RCPT TO:<"A B"@ARPA>

That can be parsed by the grammer given in rfc821.  On the other
hand, this cannot:

        RCPT TO:<A B@ARPA>

because ``A B'' contains an SP, which must be quoted somehow.

If you send a message via qmail-smtpd to the first recipient above, the
second one is what you'll see in the text of the bounce that qmail
sends you, when it mentions the original (sic) envelope address.