directadmin: This message may not have been sent by email@email.com

directadmin: This message may not have been sent by email@email.com

Dear Supporters,
When I create a hosting account for my clients, if they use gmail, a message like this will appear:
This message may not have been sent by: yourname…

From this, I want to send email to my client (when an account is created) via SMTP.
Is this possible in DirectAdmin configuration?

Thank you.

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