Hi,
follow this instructions from “Contact from 7” documentation http://contactform7.com/setting-up-mail/
At the end of the page are the most common issues with sending email with this plugin.
Also, maybe this can help you:
https://magnior.com/forums/topic/contact-form-7-does-not-send-email/
If this don’t work please try to reinstall Contact form plugin or refer to
http://contactform7.com/faq/after-submitting-the-form-i-get-an-error-message/
which now covers this issue in some details.
Hope that this will help you.
Let us know if you need anything else.
Regards
