Enhanced status code

SMTP error X.7.30

REQUIRETLS support required

Updated Jul 1, 2026

The short answer

REQUIRETLS support required Common cause: Next-hop server cannot meet the message's REQUIRETLS requirement

Quick fix

Use a route that supports REQUIRETLS or remove the requirement if appropriate

This code is written X.7.30 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

Use a route that supports REQUIRETLS or remove the requirement if appropriate

Related codes

X.7.0 Other or undefined security status X.7.1 Delivery not authorized X.7.2 Mailing list expansion prohibited X.7.3 Security conversion required but impossible X.7.4 Security features not supported X.7.5 Cryptographic failure
All SMTP error codes
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