java mail - problem z wyslaniem maila

Witam

Podczas wysylania wiadomosci przy uzyciu aplikacji w java mail dostaje taki blad:

DEBUG SMTP: use8bit false
MAIL FROM:x@x
250 Ok
RCPT TO:x@x.pl
553 x@x: Sender address rejected: not owned by user x@x.pl
DEBUG SMTP: Invalid Addresses
DEBUG SMTP: x@x.pl
DEBUG SMTP: Sending failed because of invalid destination addresses
RSET
250 Ok
javax.mail.SendFailedException: Invalid Addresses;
nested exception is:
com.sun.mail.smtp.SMTPAddressFailedException: 553 x@x: Sender address rejected: not owned by user x@x.pl

at com.sun.mail.smtp.SMTPTransport.rcptTo(SMTPTransport.java:1446)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:736)
at MailTest.main(MailTest.java:38)

Caused by: com.sun.mail.smtp.SMTPAddressFailedException: 553 x@x: Sender address rejected: not owned by user x@x.pl

at com.sun.mail.smtp.SMTPTransport.rcptTo(SMTPTransport.java:1297)
... 2 more

javax.mail.SendFailedException: Invalid Addresses;
nested exception is:
com.sun.mail.smtp.SMTPAddressFailedException: 553 x@x: Sender address rejected: not owned by user x@x.pl

at com.sun.mail.smtp.SMTPTransport.rcptTo(SMTPTransport.java:1446)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:736)
at MailTest.main(MailTest.java:38)

Caused by: com.sun.mail.smtp.SMTPAddressFailedException: 553 x@x: Sender address rejected: not owned by user x@x.pl

at com.sun.mail.smtp.SMTPTransport.rcptTo(SMTPTransport.java:1297)
... 2 more

Probowalem znalezc w necie na to odpowiedz. No ale niestety nie udalo sie :d
Adres email jest poprawny. Moge wysylac poczte z tego konta i na to konto z Outloocka wiec dlaczego nie moge uzyc do tego aplikcji w java?
Co moze byc bledne?

adres form nie ma domeny najwyższego rzędu.

a co to oznacza?
co mam poprawic?