Setting up reliable transactional emails in WordPress is essential for ensuring important messages like order confirmations, password resets, and user notifications reach your users’ inboxes. By default, WordPress uses PHP’s mail function, which is often unreliable and can lead to emails being marked as spam or not delivered at all. To fix this, start by choosing one of the trusted transactional email tools for WordPress such as Sendinblue (Brevo), Mailgun, SMTP.com, SendGrid, or Amazon SES—all known for high deliverability and robust SMTP services. Once you’ve signed up and obtained your SMTP credentials, install an SMTP plugin like WP Mail SMTP or Easy WP SMTP on your WordPress site. Enter your SMTP details into the plugin settings and authenticate your domain by adding the recommended DNS records (SPF, DKIM) provided by your email service. Finally, send a test email to confirm everything is set up correctly.