Pipelining vs. multiple failure codes

Hello.

The RFC on pipelining (RFC2920
<ftp://ftp.rfc-editor.org/in-notes/rfc2920.txt>) doesn't discuss what to
do on a temporary failure on, say, MAIL FROM. Consider the following
sequence:

  MAIL FROM
  4xx
  RCPT TO
  5xx (no MAIL FROM => RCPT TO not valid)
  DATA
  5xx (no recipients)

What should the SMTP client conclude in this case? Should it bounce the
message or try again later?

Is the intent that the DATA command returns the error that the client
should take notice of?

Thanks, regards,

-- 
Richard Dawe
Software Engineer - Mail Engine
MessageLabs Ltd., UK


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