Absolutely.
It is not bleeding edge sec. But it is *very* strong encryption and they are following industry / sec best practices.
This does not mean it is uncrackable by the likes of the NSA w/ *workarounds* to circumvent the encryption. But the encryption itself is currently directly uncrackable even by them
But, unless you've got another mitigating factor like an infected router / machine, etc, then crims should not be MtMing your mail.
Here is the servers
Qualys report. (You can check any published sever on the interwebs here.)
