Yahoogroups

Mail to yahoogroups for two days is giving some strange responses. Mail is attempting to go to 172.16.3.10 when sent to a yahoogroup. This looks real strange....that block is reserved I believe? Wondering why theyre resolving to that address? Router mismanagement? Poisoning? I dont know...but its causing some grief here... Yahoo is real lax in giving some human contact addy, perhaps the esteemed group here can shed some light... Thanks..