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SMTP Error Codes

Here is a full list of the SMTP error codes you may encounter;

Error Code
Error Type
Description
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