# authentication (server_mail_auth_condition)
exim -bs -oMa 10.0.0.2
ehlo testing.ex
auth plain AHVzZXJ4AHNlY3JldA==
mail from:<userx@test.ex> AUTH=xyz@test.ex
quit 
****
exim -bs -oMa 10.0.0.2
ehlo testing.ex
auth plain AHVzZXJ5AGFiPw==
mail from:<userx@test.ex> AUTH=xyz@test.ex
quit
****