Most internet standards are at http://www.rfc-editor.org/ it will be here
somewhere. someone else may be able to advise the specific keywords to use
in the search.

Here is something from RFC 821: ftp://ftp.isi.edu/in-notes/rfc821.txt which
may assist.

      4.2.1.  REPLY CODES BY FUNCTION GROUPS

         500 Syntax error, command unrecognized
            [This may include errors such as command line too long]
         501 Syntax error in parameters or arguments
         502 Command not implemented
         503 Bad sequence of commands
         504 Command parameter not implemented

         211 System status, or system help reply
         214 Help message
            [Information on how to use the receiver or the meaning of a
            particular non-standard command; this reply is useful only
            to the human user]

         220 <domain> Service ready
         221 <domain> Service closing transmission channel
         421 <domain> Service not available,
             closing transmission channel
            [This may be a reply to any command if the service knows it
            must shut down]

         250 Requested mail action okay, completed
         251 User not local; will forward to <forward-path>
         450 Requested mail action not taken: mailbox unavailable
            [E.g., mailbox busy]
         550 Requested action not taken: mailbox unavailable
            [E.g., mailbox not found, no access]
         451 Requested action aborted: error in processing
         551 User not local; please try <forward-path>
         452 Requested action not taken: insufficient system storage
         552 Requested mail action aborted: exceeded storage allocation
         553 Requested action not taken: mailbox name not allowed
            [E.g., mailbox syntax incorrect]
         354 Start mail input; end with <CRLF>.<CRLF>
         554 Transaction failed

      4.2.2.  NUMERIC ORDER LIST OF REPLY CODES

         211 System status, or system help reply
         214 Help message
            [Information on how to use the receiver or the meaning of a
            particular non-standard command; this reply is useful only
            to the human user]
         220 <domain> Service ready
         221 <domain> Service closing transmission channel
         250 Requested mail action okay, completed
         251 User not local; will forward to <forward-path>

         354 Start mail input; end with <CRLF>.<CRLF>

         421 <domain> Service not available,
             closing transmission channel
            [This may be a reply to any command if the service knows it
            must shut down]
         450 Requested mail action not taken: mailbox unavailable
            [E.g., mailbox busy]
         451 Requested action aborted: local error in processing
         452 Requested action not taken: insufficient system storage

         500 Syntax error, command unrecognized
            [This may include errors such as command line too long]
         501 Syntax error in parameters or arguments
         502 Command not implemented
         503 Bad sequence of commands
         504 Command parameter not implemented
         550 Requested action not taken: mailbox unavailable
            [E.g., mailbox not found, no access]
         551 User not local; please try <forward-path>
         552 Requested mail action aborted: exceeded storage allocation
         553 Requested action not taken: mailbox name not allowed
            [E.g., mailbox syntax incorrect]
         554 Transaction failed


[ -----Original Message-----
[ From: Michael Shannon [mailto:[log in to unmask]]
[ Sent: Tuesday, September 12, 2000 11:04 AM
[ To: [log in to unmask]
[ Subject: Mail error codes
[
[
[ Hello to all...
[
[ Does anyone know if there is some sort of a list available
[ for mail delivery
[ error codes?  I know that there's no definitive stadard (yet)
[ but surely
[ most mail servers use similar codes.  I just find it
[ difficult to sort out
[ what an error might be caused by when all I have is a code without an
[ explanation.
[
[ I suppose with the sheer number of different
[ software/platforms out there
[ this may be so much wishful thinking.....
[
[ Chazzozz!!
[
[ Michael Shannon
[ Webmaster
[ [log in to unmask]
[
[ Note: Views expressed on this list are my own and do not
[ reflect the views,
[ opinions or position of my employer.
[