Sending emails to myself from 'contact us' page

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VB

I am trying to create a contact us page on my website which will send the info entered to my email address using SMTP.

I got the following error:

the SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required.

Which fields do you think this is referrring to? (server, host, port, recipient, sender, etc?)