Can we use custom fonts in our Email/Mail Merge templates?

I'd like to add a custom font for use in our mail template but it's only allowing me to use certain fonts. Can we use our own custom fonts?

When completing a mail merge or email template, we only allow the following three web ready fonts:

Andale Mono
Times New Roman

We do this because these particular fonts are web fonts and automatically print correctly to PDF, simplifying the process. Other custom fonts are not available. 

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