Typing envelopes is a practical use for a typewriter.

By the time you:

• open a WP program
• find “Envelopes and Labels”
• choose label
• copy addressd
• paste address
• connect printer
• change printer paper feed
• confirm paper change
• reject “black ink low” warning
• insert envelope
• print envelope
• throw away envelope for improper geometry
• print envelope successfully

My envelope was already typed.

BTW, if you don’t use an ink-jet printer, because laser printers use plastic as ink, the plastic will wear off as the envelope passes through automatic sorting systems.

This isn’t an issue with impressions made using a typewriter ribbon.