Hi,
Now we've SSL support baked into Meteor UP. Here's how to
enable that.
For that you need to purchase a SSL certificate. I've created a
guide for that as well.
There's a project called
Let's Encrypt which will give everyone a SSL certificate for FREE. It's backed by Mozilla, EFF, Akamai, Cisco and some others.
It's not launched yet, but once it arrives(mid 2015), I'll definitely add that support too.
Hope you found this useful.