- Dec 2020
If the Klensin Standards Track [Page 19] RFC 5321 SMTP October 2008 recipient is known not to be a deliverable address, the SMTP server returns a 550 reply, typically with a string such as "no such user - " and the mailbox name (other circumstances and reply codes are possible).
Will the entire transaction be canceled? "Transaction" in the name of this a section implies yes, but what if all the recipients are valid?
See replies below but the answer is no; an
RCPTcommand is specified for each recipient in the mail data, these
RCPTcommands will be evaluated in sequence,, and any SMTP (error) notifications will be sent to the address in the
MAIL FROMcommand (which is not necessarily the same as the mail data's
If the verb is initially accepted and the 354 reply issued, the DATA command should fail only if the mail transaction was incomplete (for example, no recipients),
How could this specific scenario be even possible? It just said in the previous paragraph that
If there was no MAIL, or no RCPT, command, or all such commands were rejected, the server MAY return a "command out of sequence" (503) or "no valid recipients" (554) reply in response to the DATA command.
- Feb 2018
humans are creatures who crave a story
in relation to the language of silence (and Bacon's use of color), we must consider we may be reading too deeply into some of these works. how can we draw conclusions and meaning out of a painting, let alone stories older than most trees and from completely different societies without projecting our own feelings and experiences onto them? with this, can we trust that much of human experience over all known time are similar enough to trust and put weight into these projections?