What is Outlook error code?
SMTP Errors
| Error Code | Description |
|---|---|
| 0x800CCC6E | Invalid mailbox name syntax. |
| 0x800CCC6F | Transaction failed. |
| 0x800CCC78 | Unknown sender. This is caused by having the incorrect e-mail address in the Reply-To field. |
| 0x800CCC79 | Server rejected recipients. |
•Apr 23, 2021
