any one know why i have this error ?????

any one know why i have this error ?????

The action Report Admins has been failed. javax.mail.SendFailedException: Invalid Addresses; nested exception is: com.sun.mail.smtp.SMTPAddressFailedException: 550 5.7.1 Unable to relay for XXX@xxx.com; nested exception is: com.sun.mail.smtp.SMTPAddressFailedException: 550 5.7.1 Unable to relay for XXX@xxx.com; nested exception is: com.sun.mail.smtp.SMTPAddressFailedException: 550 5.7.1 Unable to relay for XXX@XXXcom

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