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I've been running kmail on Red Hat Enterprise 3 for years. I seem to have regular problems where kmail stops working with sendmail. It happens whenever our IT group makes any kind of change. They changed the sendmail.cf last November, I eventually sorted that out and it was working until yesterday, when IT changed something else. The sendmail.cf was not changed this time, something- our IT group won't tell me what- was changed on the mail server. The frustrating part is that the "mail" program will send mail. Thus no help from IT. They hate Linux anyway and I am one of handful trying to use my Linux box as my main machine. Whenever I have had kmail/sendmail problems, I could use mail to send mail, kmail is apparently a lot fussier. All I get is a message that says Sendmail exited abnormally. Could anyone give me any hints on how to track down where the problem is or ideally fix it. Thanks.

This turned out not to be the problem I thought it was. sendmail was simply not liking the e-mail address. I couldn't see the problem because I am not allowed to view the sendmail log file and as best I can tell, no error is reported anywhere else. The It guys finally had a look and the problem became obvious.