For those who weren't aware, I have setup a fax and voicemail honeypot using K7, which provides free Fax and Voicemail services.
Every time a new fax or voicemail is received, the message is automatically sent to my Gmail as an attached file.
Recently I enhanced this using IFTT so that I can keep a running log of when the messages come in, and look for any patterns.
It's amazing how my honeypot company receives faxes from their non-existent HR department every week, offering discount vacations and cruises! The most recent example of this is pictured below.