To understand what email clients you can use with JustOpened, you must understand a little bit about how email tracking works. To track your emails, you place a small image, called a tracking pixel, in your outgoing mails. Through JustOpened, you generate these pixels. Whenever a recipient opens an email and loads images, the tracking pixel triggers and collects data that shows up in your dashboard.
The most important part of inserting the pixel is ensuring the image source points directly to the JustOpened server (or your custom domain). The best way to achieve this is via the generated HTML-code:
Long story short, any email program that allows you to insert remotely hosted images or direct HTML code will work.
So, to find out if you can use your email program with JustOpened, check out if it is possible to "insert HTML directly" or "insert an image by URL". Native clients like Outlook, Apple Mail, and Thunderbird all support this, alongside web clients like Gmail when using extensions.
An email client that we highly recommend is Thunderbird, a free and open-source application. It natively allows you to easily insert HTML. In this example, we configured a Gmail account in Thunderbird, composed a new message, and directly inserted our tracking pixel HTML:
Insert HTML elements:
When examining the source code on the recipient's end, we verify the HTML `img` element successfully points to the remote JustOpened server. Once loaded, the event immediately registers on the JustOpened analytical dashboard.