Setting up mail

Make sure to prepare a real “WordPress” email address

Prefer a real wordpress@{your-site-domain} address on your host ( for “From” header field ).
Check below best practices.

Best practice to set up mail

Plugin original help doc: https://contactform7.com/best-practice-to-set-up-mail/

Plugin original help doc for more details: https://contactform7.com/setting-up-mail/