I used two plugins, contact form7 and pirate form, both display the message of succes but nothing coming in my inbox. Alsto tried the SMTP with google and hotmail but i recive a message that someone tried to login on my account.
For SMTP and Gmail, you will need turn on 2 step verification, then create an App specific password in security panel of google account. Use your email and that password as login credential. You'll also need use TSL or SSL for SMTP.
Hope this help!