Well, no, custom web fonts generally aren’t supported by email clients, email within Gmail is sanitized by default. And I stand slightly corrected: by customiz

Well, no, custom web fonts generally aren’t supported by email clients, email within Gmail is sanitized by default. And I stand slightly corrected: by customizing email image URLs, you can apparently track the first open, but not user details (IP address, device, subsequent opens, etc.) https://customer.io/blog/gmail-loading-images.html https://customer.io/blog/gmail-loading-images.html