What does “invalid recipient address” mean?
Invalid recipient address covers several validation failures:
Possible meanings:
User does not exist: No mailbox at this address. Format invalid: Address syntax is wrong. Validation failed: Server-side checks rejected the address. Policy restriction: This address type not allowed.
- Format issues to check:
- Missing @ symbol. Invalid characters. Domain portion issues. Local part too long.
- Typical codes:
- 550 with "invalid recipient." 553 with "mailbox name invalid." 5.1.1 (bad destination mailbox).
- Response:
- Verify address spelling and format. Suppress if confirmed invalid. Check for typos in collection process.
- Invalid recipient is a malformed destination label. The address cannot be processed as written.
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