If you need to enable SSL for your SMTP email server it's very easy to configure a couple of properties and let ATG handle the necessary configs and setup for the corresponding JavaMail All you need to do is set the following properties in /atg/dynamo/service/SMTPEmail/ : emailHandlerPort=465 (the default SSL port for SMTP) protocolName=smtps And that's it, turn on the debug for SMTPEmail and you will see it is attempting an SSL connection: **** debug Mon Aug 03 17:05:22 CDT 2020 1596492322205 /atg/userprofiling/email/TemplateEmailSender doSendEmailMessage: numMessages = 2 DEBUG: setDebug: JavaMail version 1.5.6 DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Oracle] **** debug Mon Aug 03 17:05:22 CDT 2020 1596492322215 /atg/dynamo/service/SMTPEmail Attempting to open a connection... DEBUG SMTP: useEhlo true, useAuth false DEBUG SMTP: trying to connect to host "localhost", port 465, isSSL