Girl Geekette

421  Service not available, closing transmission channel
450  Mailbox unavailable
451  Local error in processing
452  Insufficient system storage
500  Syntax error, command unrecognized
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 (or Relaying Denied)
551  User not local
552  Requested mail action aborted: exceeded storage allocation
553  Requested action not taken: mailbox name not allowed
554  Transaction failed
9100  Not enough memory
9101  A task is already in progress
9102  No recipient was specified
9103  Aborted by user
9104  Invalid email address
9105  Invalid mail server address
9106  Invalid user name
9107  Invalid password
9108  Mail server is not responding
9109  Invalid reply from the server
9111  One or more e-mails were undeliverable