I’m not using this. I’m not using any plugins to encode my contacts.
In terms of email spam it’s the job of the providers to help you out. In my case that works totally fine, I very rarely get spam mails. If your phone number gets used by dubious callers → block them.
That’s how I go about this. Been talking about these things with a friend years ago, who is a developer. He said:
«If some bot really wants your mail adress it will get it. If you are in Germany your contacts need to be accessible via whois requests anyway.»
It’s a bit like HTML email sigantures. You can put all the time and effort in to make it look cool but in the end it’s better to chill, use simple plain text and focus your creative energy onto something more meaningful.