We currently support pdf, docx, most image types (jpeg/jpg, png, heic), and excel.

saving the email as a pdf would work!

And if yes, be specific in answering. Emails are a bear! Emails can have several file types as attachemtns. Including: Other emails, Zip files, in-line images where position matters for context.

A friend seems to be doing it for email - https://dwata.com They are early but is promising