🚀 go-pugleaf

To keep track of mailings, you might consider Address Book Plus from Power
Up software. It will print mailing labels, and  envelopes. It will print
bar codes on envelopes that meet the post office's standards. It automatically
keeps track of the last time a record is modified, so that gives yo some
instant control over mailing dates. For better control, paste into Cal 3.03,
a shareware calendar desk accessory that provides a 32k-text editor window
associated with a perminant calendar, so you can paste text into any day.
Cal's data is stored in ordinary text files.

I wrote them both.