error email

Hello,
I have installed the plugin For the request quote of wordpress
I use contact form 7 as shown on video: https://www.youtube.com/watch?v=g8JCawLmHQ8
A configuration error is being detected concerning the sender email adress.
” the sender email adress does not belong to the web site domain” Although it does.
All my other contact forms work with the same configuration, under the theme WordPress “Cheope”. We are redoing our website with the theme WordPress “Total”.
Another problem appears : on the contact form, the mail shows as having been sent with success, but i don’t receive any mail in my mailbox.

Thanks for your help.

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