I found the answer in FAQ:
I cant get the email to send or change the from address
You may be having trouble sending emails due to hosting restrictions, you might try installing WP Mail SMTP and setting up a SMTP account for WordPress to use for sending emails. In some instances users have found installing WP Mail SMTP and configuring an SMTP account fixed the problem.
How can I install an older version?
Hello,
I just updated the plugin to version 2.3.5 and unfortunately all my fields have been cleared.
I just take the site in hand so I don’t know if there is a backup.
Is it possible to recover the old value of fields?
