On my list, we are having a problem with some mail not being sent until listserv is restarted. The problem begins when sendmail rejects a block of email; the error message always is "Unspecified error (450) - See RFC821 et seq." These messages then remain unsent until we manually restart listserv. Two questions come quickly to mind: o Any insight into why sendmail is rejecting some messages? o Any insight into why listserv won't automatically try to resend those messages? Doug