question: @ PropertyUpdate ( properties = { "mail.smpt.host" , "mail.smpt.port" , "mail.smpt.user" , "mail.smpt.passwd" , "mail.smtp.properties" } ) protected void onSmtpPropertiesChanged ( ) { parseAdditionalPropertiesString ( ) ; checkConnection ( ) ; }
target:  Parses the SMTP properties and checks whether a connection can be established.