Cypher Link module specifically targets BOTs' email-spamming issue. BOTs read exposed 'mailto' Email IDs and spam individuals' inboxes.
At certain level, this module helps in overcoming email-spamming issue by exposing encrypted 'mailto' Email IDs to the BOTs.

Here, concerned link items are encrypted at the server end (through PHP), and Javascript on the client side decrypts them to take appropriate action.