It would be helpful if the date of the last letter sent to a contact in the address book was listed beside their mailbox entry. I could use this feature to make sure I don’t wait too long before I use your service again to send them another letter!

We’re looking at adding the ability to track birthdays and other important dates (and schedule letters, of course). I can see this fitting well with that.

I would also like to possibly get USPS tracking numbers into this service. Possibly as an optional fee and setting?

Are you interested in delivery confirmation or the Planet Code/Intelligent Mail tracking?