I have configuared email extionsion with my credentials but still it tries to authenticate using jenkins as user and password = null

DEBUG SMTP: protocolConnect returning false, host=smtp.gamil.com, user=jenkins, password=<null>
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "smtp.gamil.com", port 465, isSSL false
MessagingException message: Could not connect to SMTP host: smtp.gamil.com, port: 465

It should use credentials I provide but why it using user=jenkins, password=<null