I was like u untill yesterday, not so correct untill half week ago.
Know wut do I do with sendmail ?
ls -la sendmail*
Then I installed postfix from http://www.postfix.com
Get the source-tarball, extract into /usr/local/src
read the INSTALL
<<need to create user postfix, group postfix,postdrop>>
<<during make install u can easily let it choose it's defaults>>
With a little configuration on /etc/postfix/main.cf u ll be able to send mail to yahoo account already. See man postfix, how to start, then have a look into /var/log/maillog to see the error u must correct, it won't be hard. after one or todays u ll say bye bye forever to sendmail. I regreted why not do that earlier ..