- 0x800CCC60 SMTP RESPONSE ERROR – Invalid response
- 0x800CCC61 SMTP UNKNOWN RESPONSE CODE – Unknown error code
- 0x800CCC62 SMTP 500 SYNTAX ERROR – Syntax error returned
- 0x800CCC63 SMTP 501 PARAM SYNTAX – Parameter syntax incorrect
- 0x800CCC64 SMTP 502 COMMAND NOTIMPL – Command not implemented
- 0x800CCC65 SMTP 503 COMMAND SEQ – Improper command sequence
- 0x800CCC66 SMTP 504 COMMAND PARAM NOTIMPL – Command not implemented
- 0x800CCC67 SMTP 421 NOT AVAILABLE – Command not available
- 0x800CCC68 SMTP 450 MAILBOX BUSY – Mailbox is locked and busy
- 0x800CCC69 SMTP 550 MAILBOX NOT FOUND – Mailbox not found
- 0x800CCC6A SMTP 451 ERROR PROCESSING – Error processing request
- 0x800CCC6B SMTP 551 USER NOT LOCAL – User mailbox is known but mailbox not on this server
- 0x800CCC6C SMTP 452 NO SYSTEM STORAGE – No space to store messages
- 0x800CCC6D SMTP 552 STORAGE OVERFLOW – Storage limit exceeded
- 0x800CCC6E SMTP 553 MAILBOX NAME SYNTAX – Invalid mailbox name syntax
- 0x800CCC6F SMTP 554 TRANSACT FAILED – Transaction failed
- 0x800CCC78 SMTP REJECTED SENDER – Unknown sender
This is caused by having the incorrect e-mail address in the ‘Reply To’ field. - 0x800CCC79 SMTP REJECTED RECIPIENTS – Server rejected recipients
- 0x800CCC7A SMTP NO SENDER – No sender address specified
- 0x800CCC7B SMTP NO RECIPIENTS – No recipients specified
