Enhanced status code Temporary

SMTP error X.4.7

Delivery time expired

Updated Jul 1, 2026

The short answer

Delivery time expired Common cause: Message remained undelivered until retry period expired

Quick fix

Investigate the earlier delivery failures before resending

4 - Temporary. Safe to retry. The message is not lost and most servers retry automatically.
This code is written X.4.7 because the reason is the same whether the failure is temporary (a 4 first digit) or permanent (a 5). Read the first digit of your own bounce to know which applies.

How to fix it

Investigate the earlier delivery failures before resending

Related codes

X.4.0 Other or undefined network / routing status X.4.1 No answer from host X.4.2 Bad connection X.4.3 Directory server failure X.4.4 Unable to route X.4.5 Mail system congestion
All SMTP error codes
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