(Most of the above applies for s/US/$country/g as well.)
You're likely better off hosting a mail server here in the US, not actually storing any mail on it, downloading the mail immediately to a local mail store on an encrypted disk, and using encrypted email to protect new mails. That still won't render you immune to prosecution, but you might consider the consequences of refusing to decrypt a server preferable to the consequences of revealing the contents of your email. Or not.
I think the main danger of using a foreign host would be that the NSA has more spying leeway with international traffic so they probably will have already slurped and archived your mail off of the wire without needing to ask your mail host. SSL is supposed to help with that but I have my doubts that that stops the NSA if they want to target you.
When US citizens are assassinated by presidential order rather than being brought to trial it's probably time to 'make your life easier' rather than wait around for the ICC.
Both Sonic and Google fought over the right to inform Mr. Appelbaum of the request for his data and won (afaik).
The article says it is not known whether Google fought against having to hand over the data, like the ISP Sonic did.
Which makes me assume the writers asked Google, they didn't answer, neither did they issue a press report one way or the other. Which leads me to believe that, no, Google did not fight the actual request and unlike the small ISP Sonic did just comply in order to make their lives easier.
Of course it's just speculation but why else would we know about the other case Google did fight in this matter?
Additionally, why would Google go through that trouble, they have no interest either way, and are not in the business of protecting their users from surveillance state governments. Apparently.
The law is the law, and they must comply.