Jenkins not sending email "Got bad greeting from SMTP host" - email

Question

I am trying to send an email from a Jenkins pipeline but I am getting the following error
Adding recipients from trigger recipient list
Successfully created MimeMessage
Sending email to: 1211732#isep.ipp.pt
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]
DEBUG SMTP: need username and password for authentication
DEBUG SMTP: protocolConnect returning false, host=smtp.gmail.com, user=p-bri, password=<null>
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "smtp.gmail.com", port 465, isSSL false
DEBUG SMTP: EOF: [EOF]
DEBUG SMTP: got bad greeting from host "smtp.gmail.com", port: 465, response: [EOF]
MessagingException message: Got bad greeting from SMTP host: smtp.gmail.com, port: 465, response: [EOF]
I configured the SMTP with the following configurations
This is how I am sending the email
stage('Send confirmation email') {
emailext(
subject: "Pipeline notify - BUILD: '${env.JOB_NAME}#${env.BUILD_NUMBER}'",
body: """The pipeline runned successfully. The following tasks have been made:
- Project built
-Javadoc generation and publish
-Runned integration and mutation tests and published its respective reports
-Deployed the project to Tomcat, running at http://localhost:8888
Build can be found at: ${env.BUILD_URL}""",
recipientProviders: [[$class: 'DevelopersRecipientProvider']],
to: "1211732#isep.ipp.pt"
)
}

Answer 1

Try the following settings. This has worked for me.