Invalid Addresses javax.mail.SendFailedException: nested exception is: com.sun.mail.smtp.SMTPAddressFailedException: 550 5.7.1 Unable to relay for

[Anonymous]

Invalid Addresses javax.mail.SendFailedException: Invalid Addresses;
nested exception is: com.sun.mail.smtp.SMTPAddressFailedException: 550 5.7.1

While sending a group email getting above error .What can be the best solution to resolve the given error?

[Anonymous]

Hello,

The error message shows that the exception is occurring at SMTP API level because of the SMTP server.

To resolve the issue, contact your SMTP Administrator. You can also try these solutions:

• Review the SMTP server log for more information.

• Use the Wireshark tool to see exceptions thrown from the SMTP server response

Best regards

Sabrina