535 5.7.3 — Failed SMTP authentication
Field: SMTPPriority: High
What does this error mean?
The server refuses the, ID, password or method of authentication.
Probable causes
- Invalid password
- SMTP AUTH disabled
- MFA without password of application
- Account blocked
Verification and resolution
- Test IDs on the webmail
- Verify that SMTP AUTH is allowed
- Control port and encryption
- View Log Log
Precaution: Never store a SMTP password in plain language in a public repository.
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