Using Internet Commands like SMTP used to be the typically way for sending email prior to v19. However, troubleshooting error codes can feel a bit dated as it requires looking up the error code each time any issue comes up.

Instead, it is recommended to start using SMTP New transporter as a replacement as the returned result is an object containing attributes "status" for error code and "statusText" for the reasoning for the error. Take an authentication error example below:

SMTP_Send error:


Transporter.send() error: