$ errors.fyi/smtp/454 74 namespaces · 3,092 codes

smtp · smtp/454

454

TLS not available

The server cannot begin a TLS negotiation (STARTTLS) at this time. The client may retry the command or use a different security mechanism.

References

rfc-editor.org/rfc/rfc5321

In this namespace

← previous 452 Insufficient system storage next → 455 Server unable to accommodate parameters

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