Contact Form 7 Email Add on plugin provides the responsive Email templates to admin and users.
Intercept emails sent with wp_mail() into flexible mail queue for sending emails, convert plain text emails to HTML, email log, and more.
Decreases the chance of your legit emails being marked as spam by providing a text alternative within the one email.
Adds a text/plain email to text/html emails to decrease the chance of emails being tagged as spam.