Viktor Dukhovni via Postfix-users:
> On Fri, May 31, 2024 at 02:01:50PM +0200, Gerben Wierda via Postfix-users
> wrote:
>
> > It sends: "PROXY TCP4 192.168.2.2 192.168.2.2 65535 587\r\nQUIT\r\n"
> > It expects a response that matches regex ^220
>
> Don't send "QUIT\r\n", just send the PROXY handshake and wait for 220,
> and then drop the connection, or if not difficult to specify, send QUIT
> *after* the 220.
Viktor is correct. Your probe talks SMTP too soon, and the real
fix is to not send QUIT before Postfix responds.
Wietse
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