I also email collection letters and have been doing it for about a year know. Please note this is in addition to our mailed letters, and phone calls as well. What I have found is that phones get get disconnected and shut off all the time, where they usually keep and check there email. It's a great tool to utilize in addition to mail and phone calls. And yes we also utilize the email to send out a thank you for storing with us letter that also points out facility features, such as referral payments, access hours, etc.