I'm very new to sendmail administration. I have been successfully running sendmail on Linux for about a month now but have noticed that a few remote servers timeout during the connection. I am using WebMin to view the contents of the mail queue and notice that the time outs always occur with the same few servers from some of our business clients. The error I get is "connection deferred," but its deferred forever until the queue finally bounces the mail back to the sender. What would cause this connection to be deferred? I can succesfully send to these remote servers using hotmail. I can ping them and telnet into port 80, so I don't think I'm being blocked at the packet-level. ANy help would be appreciated.