Error message when sending email on GMAIL

Hello
I just created a form with chronoform with acknowledgment of receipt following your tutorials (I already did and it was very good)
But this time, I have to deal with a "GMAIL" and I get an error when sending see screenshot below


You will also see the screenshots on my parametrage for email (I also made with port 465) and also e-mail the administrator and also parametrage email acknowledgment.
Why does not it work?
thank you

Hi thyboob,

Please see this FAQ I can see that the To and From Emails are the same; and the From Email may not match the site domain.

Bob