Form ceased sending mail on several sites

Hi there I am in a big dilemma, because across a number of sites that have used this plugin for years now, in spite of a confirmation message after submission, no email gets sent to the set target mailand not even a copy to the sender. This seems to have just stopped working. I have changed nothing on the sites for years and was surprised that no mail is sent. I contacted the webhost asking if they have changed anything on their side that could be preventing the mail function and they say they have not. WordPress + all plugins are up-to-date. Under Site Health => Tools => Mail check, of one of the sites, there is: “The Mail Check will invoke the wp_mail() function and check if it succeeds. We will use the E-mail address you have set up, but you can change it below if you like.” If you send a test email, in spite of this confirmation “ We have just sent an e-mail using wp_mail() and it seems to work. Please check your inbox and spam folder to see if you received it. “, no email comes to that Gmail mailbox, not even to the spam folder. What could be going on and how can the problem be quickly solved, by a non-coder? Thank you in advance The page I need help with: [ log in to see the link] Hi, 1) Check the plugin settings => ‘Sending Method’ => change the lines from wp-mail to mail and vice versa. 2) Email messages can be marked as spam on the server. Choose another email. Try to change your email in the email address settings in the ‘From’ field instead of User email. If the message is sent, it means that email filtering is set on your server. 3) Thy to install and configure SMTP plugin. Hi, Since there is no reply from you, we consider this topic as resolved. We hope you’ve found the solution. Have a nice day.