Hello @BintheLoop ,
For a lot of email programs, it's 100% dependent on how the recipient has chosen for emails' text to display (default being Sans Serif), but is also dependent on what fonts are actually available in the program, browser, or device.
Similarly with links, some email programs (particularly Outlook) will force links to show as blue and underlined as a security measure, since phishing emails have historically tried to hold bad links as normal-looking text. This is a default functionality that you might be able to alter in your email program's settings, but there's no guarantees with this.
If the receiving side's default elements and existing font options don't include the font type you've selected, there's nothing that can be done besides using a more basic, email-safe font type. Otherwise, you could also potentially utilize a screencap of the preferred font, and include the title sections as images, but this can lead to other display issues if the recipient doesn't allow images to display without manually approving/downloading first.
See also:
Display Issues – Why does my email look different when received?
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