Article - CS362186
Troubleshooting SMTP Email Server issues with ThingWorx Policy Server 7.1
Modified: 21-Aug-2025
Applies To
- Axeda - Connectivity 7.0
Description
- Issues with email notifications not being received by SMTP Server
- How to test SMTP Server from Policy Server
- What communication protocols can be used
- APS log displays
ERROR 2022-xx-xx 10:13:10,423 [Emailer]: Unable to send email com.sun.mail.smtp.SMTPSendFailedException: 451 5.7.3 STARTTLS is required to send mail [xxxxxxxxx.xxxxxxx.xxxxxx.outlook.com]
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