When comparing Hushmail vs GMX, the Slant community recommends Hushmail for most people. In the question“What are the best online webmail services?” Hushmail is ranked 11th while GMX is ranked 12th.
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Pros
Pro Ad-free
Pro Unlimited email aliases
Pro Built-in encryption
Pro Has a free plan
Hushmail has a free plan that includes 25mb of storage. It's important to note, that in order to keep it active it requires signing in at least once every 3 weeks. Subscription versions increase storage capacity and remove the mandatory sign-in.
Pro 65 GB storage secure and free
Cons
Con "Free" option is very restrictive
We offer a free account with limited storage (25 MB) and no mobile or desktop access. [..]You'll need to sign in at least once every three weeks to keep your free account active.
Con Account locking issues
GMX tends to lock accounts often, which is most likely cause by a reactionary measure to block spam accounts. The downside being that many regular users have gotten hit by this, making for an extremely poor experience.