• Fluent SMTP plugin
  • WP Mail Plugin that connects with your Email Service Provider
  • makes sure your emails are delivered
  • https://fluentsmtp.com
  • https://wordpress.org/plugins/fluent-smtp/

• Postmark / Active Campaign – https://postmarkapp.com
• SendGrid – https://sendgrid.com
• MailGun – https://www.mailgun.com
• MailerLite – https://www.mailerlite.com
• Brevo (SendInBlue) – https://www.brevo.com