Getting the below exception when using SMTP to send mail for particular user.
Caused by: com.sun.mail.smtp.SMTPAddressFailedException: 550 5.1.1 [email protected]... User unknown.
here in this exception above , [email protected] is valid user but still SMTP causing some issue.
what might be the issue and root cause for this problem?
Tried restarting the SMTP but still failing