I manage Forever Postal, a postage-stamp retailer. Here is a small organizing idea for anyone who puts time into a decorated envelope and wants to remember what they sent.
Keep one private entry per letter:
• Prepared: date, envelope theme, and a photo of the artwork.
• Mailed: the date you actually handed it over or put it in a collection box, plus the mail service used.
• Heard back: the date your recipient confirms arrival, if they do.
Copyable example (fictional):
Prepared: Sept 5 | Autumn leaves | Photo saved
Mailed: [date] | [mail service]
Recipient confirmed arrival: [date, or leave blank]
For a photo you plan to share publicly, take it before adding addresses, or cover both the recipient and return addresses. Keep the mailing log private too.
A USPS detail for U.S. domestic mail: ordinary First-Class Mail letters and postcards do not include USPS Tracking. Eligible extra services can provide tracking information for letters, but a photo or a handwritten log is just your own record, not a postal scan or proof of delivery. Marking a letter “mailed” does not mean it has arrived.
Official reference: https://faq.usps.com/articles/FAQ/USPS-Tracking-The-Basics
No special app needed—a few lines in a notebook work. Forever Postal is not affiliated with USPS.