I have client who is not able to post any messages through Yahoo to the list. Using different Internet email makes no difference either. The error message is: Subject: failure notice Hi. This is a the qmail-send program at yahoo.com. I'm afraid I wasn't able to deliver your message to the following addresses. This is a permanent error; I've given up. Sorry it didn't work 147.226.7.236 does not like receipient. Remote host said: 550 5.7.1 Unable to relay for [log in to unmask] Giving up on 147.226.7.236 They have no problem using campus mail program (Outlook) to post messages to the listserv. Any suggestions would be appreciated. H. Tabari