Wael MANAI:
> Yes I know that. Look this is the mailer-daemon sent by postfix (bold
> line at the end of the message). In the notification only "552
> Requested ..." must appear, why 250-PIPELINING too?

By the multiline rule of RFC 5321:

1) The EHLO reply is:

    250 whatever

2) The MAIL FROM reply is

    250-PIPELINING
    552 whatever

Of course, this is malformed SMTP. Postfix reports the entire
response instead of trying to "fix" malformed SMTP.

        Wietse

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