When a user pastes a link in Mixmax, it gets turned into a link using Mixmax's default link resolver integration. The preview is generated using Open Graph meta tags found in the website's <head> tag:
<meta property="og:title" content="" />
<meta property="og:image" content="" />
<meta property="og:description" content="" />
Thumbnail images must png, jpg, or gif. Images must also be at least 120px wide and 60px tall.
So the following link preview:
is generated by the following open graph tags:
<meta property="og:title" content="Free unlimited email tracking, scheduling, polls, and surveys for Gmail | Mixmax" />
<meta property="og:image" content="https://mixmax.com/images/microsites/features/entrepreneurs-compose.png" />
<meta property="og:description" content="Send engaging emails with instant scheduling, free unlimited email tracking, polls, and surveys right in Gmail." />
Mixmax fetches the website using the user agent Mixmax-LinkPreview 1.0 (+https://sdk.mixmax.com)
If you'd like a custom preview for Mixmax only (so you don't need to change your existing open graph tags), you can use these special tags. These will be preferred over Open Graph tags.
<meta property="mixmax:title" content="" />
<meta property="mixmax:image" content="" />
<meta property="mixmax:description" content="" />