Back in my Amiga-using days, I had an email program called YAM. It was excellent and ubiquitous; almost everyone used it. It had three unique features:
- You could configure it to embed small bits of personal information in outgoing emails, such as your birthday.
- When it saw these bits in email that other people sent to you, it could add the information to your address book.
- It had an option to automatically send a "happy birthday" email to everyone in your address book on their birthday.