Sending email through 3rd party email provider problem

I'm currently using everyone.net to manage my email service for a particular domain that I have. When I send email to that domain, it goes to the 3rd party service, which means that I have my MX records set correctly.

But when I try to send email through the service, it is giving me this error:
Your email was NOT sent. The following problem(s) occurred:

authentication failed: Authentication failed
Would that be a problem on eveyone.net side or on my server? I'm running Ensim on my server and I know that to relay emails from a particular domain (mail.domain.com), you need to authenticate yourself. Could that be the problem?

If so, how do I fix it?

 

 

 

 

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