Viewing EML files

As mails bounch around some email programs (I’m looking at you, Microsoft), seems to encrypt package forwarded mails in attachments with the extension .eml. On Linux… While Mozilla Thunderbird should be able to read them (as should Evolution), it requires you have the mail application available on your machine, but I haven’t - I’m doing just fine with GMail in the browser. So far the best solution I’ve find - assuming it’s trivial non-sensitive, personal files - that an Online viewer seems to work pretty well.