jmail.SMTPMail error '8000ffff'.The message was undeliverable. All servers failed to receive the message

jmail.SMTPMail error '8000ffff'
The message was undeliverable. All servers failed to recieve the message
The mailserver(s) you specified either weren't set up to receive emails from your webserver or you didn't enter a valid mailserver. You must enter the full name or IPaddress, you can't just enter the network name of your mailserver. Also, some systems prefer if you specify port, which usually is 25.
 

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