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Proofpoint, Inc.

Why are journal reports sent via SMTP (Local Exchange) connection rejected with error: 530 5.7.0 Must issue a STARTTLS command first?

Situation After configuring the archive with an SMTP (Local Exchange) connection journal reports are being bounced with a 530 5.7.0 Must issue a STARTTLS command first rejection.
Solution Need to ensure that enforce TLS is enabled on the Exchange side connector.

 

The SMTP (Local Exchange) connection requires TLS and will not fallback to plain text if no supported version of TLS is found.

You need to ensure that enforce TLS is enabled on the Exchange side connector and you are using a supported version of TLS i.e. TLS 1.1 or TLS 1.2.