Issue

While configuring the Email Connector module, an error resembling the following stack trace is thrown:

2024-08-15T11:37:39.327877 [APP/PROC/WEB/0] ERROR - Email_Connector: Failed to connect to email server. : 535 5.7.3 Authentication unsuccessful [XXX.XXX.PROD.OUTLOOK.COM 2024-08-15T11:37:39.281Z XXX]
2024-08-15T11:37:39.327973 [APP/PROC/WEB/0] Stacktrace : com.mendix.systemwideinterfaces.MendixRuntimeException: com.mendix.datahub.connector.email.utils.EmailConnectorException: EC0x034: Error while connecting to server.
2024-08-15T11:37:39.328034 [APP/PROC/WEB/0] at com.mendix.basis.actionmanagement.ActionManager.executeSync(ActionManager.scala:109)
2024-08-15T11:37:39.328111 [APP/PROC/WEB/0] Caused by:
2024-08-15T11:37:39.328177 [APP/PROC/WEB/0] com.mendix.datahub.connector.email.utils.EmailConnectorException: EC0x034: Error while connecting to server.
2024-08-15T11:37:39.328238 [APP/PROC/WEB/0] at com.mendix.basis.actionmanagement.ActionManager.executeSync(ActionManager.scala:109)
2024-08-15T11:37:39.328335 [APP/PROC/WEB/0] Caused by:
2024-08-15T11:37:39.328402 [APP/PROC/WEB/0] EC0x034: Error while connecting to server.
2024-08-15T11:37:39.328608 [APP/PROC/WEB/0] at com.mendix.basis.actionmanagement.ActionManager.executeSync(ActionManager.scala:109)
2024-08-15T11:37:39.328736 [APP/PROC/WEB/0] Caused by:
2024-08-15T11:37:39.328778 [APP/PROC/WEB/0] Was unable to connect to SMTP server
2024-08-15T11:37:39.328844 [APP/PROC/WEB/0] at com.mendix.basis.actionmanagement.ActionManager.executeSync(ActionManager.scala:109)
2024-08-15T11:37:39.328949 [APP/PROC/WEB/0] Caused by:
2024-08-15T11:37:39.329007 [APP/PROC/WEB/0] 535 5.7.3 Authentication unsuccessful [XXX.XXX.PROD.OUTLOOK.COM 2024-08-15T11:37:39.281Z XXX]
2024-08-15T11:37:39.329123 [APP/PROC/WEB/0] at com.mendix.basis.actionmanagement.ActionManager.executeSync(ActionManager.scala:109)

Environment

Email Connector (all versions)

Cause

This issue generally lies with the SMTP configuration itself, and not within Mendix.

It could be that the SMTP authentication of the user's account has not been enabled, or that the user has not configured their SMTP server correctly.

Solution/Workaround

Although a platform issue cannot be excluded, the issue likely lies with the SMTP configuration itself and not within Mendix, based on the error.

Ensure that the prerequisites of the Email Connector module are met and that the SMTP server is configured correctly.

Consult the resources under Additional Information to resolve any SMTP server issues.

Additional information

Mendix documentation:

• Email Connector - Marketplace
• Email Connector - Documentation
• Sending Email - SMTP Documentation

Other documentation:

• Enable or disable authenticated client SMTP submission (SMTP AUTH) in Exchange Online
• 535: 5.7.3 Authentication Unsuccessful
• SMTP Return 535: 5.7.3 Authentication Unsuccessful Error
• Solution: 535 5.7.3 Authentication Unsuccessful - Office 365 SMTP Error
• 535 5.7.139 Authentication Unsuccessful