Besides I try to avoid giving out my mobile number. Keep work calls at work, don't need to be called after I have already clocked off or am on holiday

Well, that's a suggestion I've heard, as opposed to paying full retail price.

Would it be any easier to replace the envelope? Still will be tricky to automate because if you have some paranoid envelope, need to replace that one with another paranoid looking envelope and a printed recipient address, and maybe a stickon return address. Still there could be those envelopes that self-destructs the message in 5 seconds...

Use the app at the touch of your fingertips to see if your neighbor is out and take what you want!

I wonder if they are using Brother Printers. My experience with printing with Ubuntu at home is it printing 1 page every 10 minutes, compared rebooting into windows at several pages per second. The same multifunction device works really well at scanning however on Ubuntu.