physical mail has gotten way more expensive, now 78 cents for a regular letter and $5 for a small package. So it adds up. I probably send a dozen emails a day while sending out maybe 3 envelopes per month, usually stuff like bill payments or business docs, rather than personal letters.

they collect all the metadata now, i.e. photographs of the front and back of the envelope. I try not to write return addresses on envelopes but sometimes it’s necessary and sometimes I forgot to omit it. They do get delivered without the return address, though I don’t have enough samples to say the reliability is any different.