I am seeing this with the default Segoe font too. This seems like it is related to:
That thread mentioned a CSS template workaround… I played around with it and it looks like the following workaround worked for me:
- Create a .html file with the content (substitute your desired font):
<style>
body { font-family: 'Segoe UI', sans-serif; font-size: 12pt; }
</style>
- Import it as a template (under Settings > Mail > Templates and Signatures).
- Apply this template to all your emails.
eM Client should really be doing this. The problem is that when I send an email, eM Client sets the font but is missing the sans-serif fallback in the CSS:
body { font-family: 'Segoe UI'; font-size: 12pt; }