Try this
- Confirm the address and whether mail is welcome. Decide which details you would be comfortable putting in an envelope that could be misplaced.
- Use a separate private channel for time-sensitive plans or information the recipient should not receive through mail.
A worked example
“I’d like to send a short letter about our last visit. Is the address you gave me still a comfortable place to receive it?”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
Do not expect an immediate reply or matching letter. If the contents need correction before delivery, send a clear update through the usual channel.