[Radiant] Problem after switching to production mode

[John Aneston]

Hi guys,
On development mode the contact-us form worked fine on radiant after
switching to production mode i get an error message like this...

"Error encountered while trying to send email. 554-xx.xx.xx.xx has not
been authenticated to relay mail 554 Connect to your mailbox before
sending mail via this relay"

note:
i have changed the ip to xx

any suggestion...

regards
john aneston

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