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object is not an instance of declaring class at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1227) at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:322)
java.lang.IllegalArgumentException: object
is not an instance of declaring class
        at
com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1227)
        at
com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:322)	at javax.mail.Service.connect(Service.java:236)	at javax.mail.Service.connect(Service.java:137)