I think it's a good idea to strip read receipt request headers from mailing list messages; they just don't make any sense in that context. But more generally,

I think it's a good idea to strip read receipt request headers from mailing list messages; they just don't make any sense in that context. But more generally, MDNs and DSNs do serve a useful purpose when used conscientiously, and I don't think it makes sense to block them for all messages. The real problem isn't the notification requests themselves, but email clients that implement the notifications badly.