X.7.19 · Security or policy
SMTP enhanced status code 5.7.19
RRVS test cannot be completed
X.7.19 means the receiving system could not complete a Require-Recipient-Valid-Since check because it has no record of the needed timestamp.
| Registry code | X.7.19 |
|---|---|
| Forms in use | 5.7.19 |
| Registry name | RRVS test cannot be completed |
| Subject | 7: Security or policy |
| Permanent or temporary | 5.x.x permanent failure: resending unchanged will not succeed |
| Associated basic codes | 5XX |
| Defined in | [RFC 7293] |
What the registry says
This status code is returned when a message is received with a Require-Recipient-Valid-Since field or RRVS extension and the receiving system cannot complete the requested evaluation because the required timestamp was not recorded. The message originator needs to decide whether to reissue the message without RRVS protection.
IANA SMTP Enhanced Status Codes registry, X.7.19
In practice
X.7.19 means the receiver could not check the RRVS date because it never recorded when the mailbox was created. RFC 7293 leaves the decision to the sender: resend without the check, or do not send. It is very rarely seen. Because the check could not run, the message was not delivered, but nothing is known to be wrong with the address. RFC 7293 describes the trade-off in detail.
What the sender should do
Decide whether to resend without the RRVS check, as RFC 7293 leaves that to the sender.
Would verifying the list have prevented 5.7.19?
No
This reply is about your sending setup, the message or the receiving system, not about whether the address exists, so verifying the list will not prevent it.
Common questions
- What does 5.7.19 mean?
- X.7.19 means the receiving system could not complete a Require-Recipient-Valid-Since check because it has no record of the needed timestamp.
- What should I do about 5.7.19?
- Decide whether to resend without the RRVS check, as RFC 7293 leaves that to the sender.
- Would an email verifier have caught 5.7.19?
- No. This reply is about your sending setup, the message or the receiving system, not about whether the address exists, so verifying the list will not prevent it.
Sources
- IANA: SMTP Enhanced Status Codes registry (checked 2026-11-05)
- RFC 3463: Enhanced Mail System Status Codes (checked 2026-11-05)
Registry and provider wording is quoted exactly; guidance is written by the SimpleVerifier Team.
SimpleVerifier Team · Last checked against the sources 2026-11-05