788
Reasonable response rule
(slrpnk.net)
Behavior rules:
Posting rules:
NSFW: NSFW content is permitted but it must be tagged and have content warnings. Anything that doesn't adhere to this will be removed. Content warnings should be added like: [penis], [explicit description of sex]. Non-sexualized breasts of any gender are not considered inappropriate and therefore do not need to be blurred/tagged.
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Other 196's:
So I have been unable to quickly confirm this on the post office directly, but the commonly cited rule online is quoted as 917.243(b).
If we can believe the multiple sources and the rule hasn't been changed, I recalled it a little incorrectly. Using such a letter as a label is legal but if they deem it an improper usage, like directly mailing a brick with the letter taped to it, they reserve the right to just dispose of it. No trouble for the sender though, so it can't hurt.