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
5xx (no MAIL FROM => RCPT TO not valid)
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?
Software Engineer - Mail Engine
MessageLabs Ltd., UK
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