unrealircd_mods/man/nopmchannel.md

[SPEC] nopmchannel

A request by westor, this module is p much the opposite of my message_commonchans in that it prevents users from privately messaging each other if they share a specific channel. There are a few exceptions (as usual ;]):

• People with any of the +hoaq access modes, as well as U-Lined users (e.g. BotServ bots), can send and receive normally to/from all channel members
• IRC opers can always send to other members but not receive, unless they have one of above-mentioned access modes

Config block:
nopmchannel {
name "#somechannel";
name "#another";
// More go here
};

I went with a config block instead of a channel mode because the module imposes restrictions on user-to-user communications, which is more of a network thing instead of channel-level. ;]