Why can't I send emails with PHP mail()?

We have decided not to allow sending emails via Sendmail/PHP Mail, for the following reasons:

1. Reliability: Sendmail/PHP Mail is prone to problems such as emails landing in the spam folder, not being delivered, or being blocked by spam filters. Using the SMTP protocol reduces the likelihood of such problems and improves deliverability.

2. Security: Sendmail/PHP Mail offers limited security features and can be vulnerable to abuse or spoofing. Using SMTP with authentication provides a more secure way to send emails and reduces the risk of spam or phishing activity.

3. Flexibility: By using an SMTP plugin for WordPress, customers can use different SMTP services and adapt their email configuration to their needs. This allows better control over email sending and optimizes deliverability.

Here are three current SMTP plugins for WordPress that you can use to send emails via SMTP:

1. WP Mail SMTP by WPForms: https://wordpress.org/plugins/wp-mail-smtp/
2. Easy WP SMTP: https://wordpress.org/plugins/easy-wp-smtp/
3. Post SMTP Mailer/Email Log: https://wordpress.org/plugins/post-smtp/

Please note that you can download and install the plugins directly from the official WordPress plugin directory page. Make sure you use the latest version of the plugin and check the documentation for further instructions on configuration and use.