SMTP Error: Failed to send the test message. Service not available, closing transmission channel. The server response was: 4.3.2 Service not available (4380740)

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SMTP Error: Failed to send the test message. Service not available, closing transmission channel. The server response was: 4.3.2 Service not available
Description

SMTP Error: Failed to send the test message. Service not available, closing transmission channel. The server response was: 4.3.2 Service not available
Resolution

The error message "Failed to send the test message. Service not available, closing transmission channel. The server response was: 4.3.2 Service not available" stopped occurring and notification was sent successfully when the 465 SMTP port number under the SMTP Authentication.

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