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SMTP Error "530 must issue a starttls command first"

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Article ID: 162456

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Updated On:

Products

Messaging Gateway

Issue/Introduction

Unable to send outbound email to a particular domain.
From message audit log, it is showing this error: "530 must issue a starttls command first"

Resolution

Check and ensure SMG delivery setting is configured to attempt TLS encryption to deliver message.
1. Go to Administration > Configuration > Host > SMTP > Advanced Settings > Delivery.
2. Tick "Attempt TLS encryption for delivery of all messages"
  
3. Click Continue and Save.
 

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