I have developed a web app which is sending HTML email using PHP. I would like to let the user be able to see what the email will look like in various email clients (Outlook/Gmail etc) before sending it out.
I searched, but I could not find any plugins that would let me do this.
I found the Litmus email preview API which would work, but it is too expensive. Is there any website that has a similar API for a cheaper price or free that I can use? Or is there any way I can do this myself without the need of some other website.
To send bulk emails to clients, I use "poMMo" (https://github.com/soonick/poMMo), it allows you to view the email and even receive an email test, before sending it to the clients.