The extrainfo patch for servers should store a piece of metadata that indicates whether the player has mail turned on, so that a person spectating a game in dgamelaunch who tries to mail a player with mail turned off will get a message explaining that.

If you are illiterate and receive some mail, the mail daemon will offer to read it to you.

You can occasionally find flyers in the dungeon (especially on the earlier levels) advertising shops on certain levels. Or else the mail daemon will occasionally deliver you a scroll of mail which is one of these flyers.

Reading a mail scroll should take 0 actions.

When a mail daemon delivers a scroll of mail and you have kept illiterate conduct so far, it offers to read the message to you rather than just giving you the scroll which you can’t read.

Junk mail is not only addressed to the finder of the Eye of Larn, but contains references to other games too.

Reading mail does not break illiterate conduct.

In variants with felt markers, allow them to write spellbooks and scrolls of mail - the other scrolls are the only thing they can’t write.