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"
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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