Our ISP just shutdown the smtp server that we have been using to send mail with on our unix boxes. The server did not require any authentication. The unix boxes are running different apps on them that occasionally need to send out email to alert our support people to problems with the server or the apps.
The only option that our ISP has given us is to use a new smtp server that the ISP created. The catch is that we have to authenticate to the server now.
HOW do I configure my unix sendmail client to authenticate to a smtp server in order to send mail.