Viktor Dukhovni via Postfix-users:
> On Thu, Sep 18, 2025 at 11:16:43PM +0200, Steffen Nurpmeso via Postfix-users 
> wrote:
> 
> >   p$ telnet localhost 25
> >   ...
> >   220 kent.sdaoden.eu ESMTP Postfix
> >   ...
> >   RCPT TO:<"<stef...@kent.sdaoden.eu>" <stef...@kent.sdaoden.eu> 
> > (<stef...@kent.sdaoden.eu>)>
> >   250 2.1.5 Ok
> 
> This is garbage in, confusing RFC2822 message header address syntax)
> with RFC2821 (SMTP envelope address syntax).  Perhaps you meant to
> give examples of "From:" headers with addresses that sloppy parsers
> would mishandle.  The above should simply be rejected.

With "strict_rfc821_envelopes = yes":

RCPT TO:<"<stef...@kent.sdaoden.eu>" <stef...@kent.sdaoden.eu> 
(<stef...@kent.sdaoden.eu>)>
501 5.1.3 Bad recipient address syntax


        Wietse
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