sendmail woes

Hello, I have tried holding this request back but now beg you for your help :-) I want to get the simplest of sendmail configurations set up so I can use Mutt and fetchmail. I have a dialup 56k connection and an ISP that distributes my mail. I collect mail via pop3. My iMac is called 'linux'. For the past three weeks, I have looked everywhere on the web for clues on what to do, but nothing seems to work. So far, I can only get mail via Mutt's pop3 feature (not fetchmail) and sending mail returns the mail to me saying linux.local is not recognised. Using YaST, what settings do I have to change from a freshly installed SUSE 7.0? I really would like to get this over and done with. Thanks so much joss