text to email from Contact Details

https://bugzilla.mozilla.org/show_bug.cgi?id=997547
Hi all,
I do agree with @julienw, we should keep it, the fact that we have that pattern is to make it compatible with the dialer app (but we allow letters, since in some countries that would be acceptable). But keeping the limit of 50 characters, back in early days we decided that was a decent limiation to avoid overflow problems.

I would go for having a 'email' property, it will make splicit that we are sending an email or a phone number, and that could be useful for 3rd party apps.