“To join an email list before 1986, users had to wait for someone to painstakingly adjust the code to include them. For Eric Thomas, that was too uncomputerized for a computerized system. So he created Listserv, the first automated email-list-management software. It's still used to send group emails, though a lot more of them—30 million emails are sent using Listserv each day, a huge leap from 25 years ago, when electronic mail was just taking off.”
Read the rest here. The L-PSDSGNR listserv that I host for designers at Penn State has been in existence since January 21, 2000 and currently has 105 subscribers.