Sendmail issue

Im a total noob as far as sendmail. I can’t get sendmail to actually send emails from wordpress under apache http server.
If I do a ps -ef | grep mail I can see the following(sorry about the wrap issue):

root 2532 1 0 Feb15 ? 00:01:21 sendmail: accepting connections
smmsp 2540 1 0 Feb15 ? 00:00:00 sendmail: Queue runner@01:00:00 for /var/spool/clientmqueue
root 26654 1 0 19:44 ? 00:00:00 sendmail: ./l36NiDEj026652 b.mx.mail.yahoo.com.: user open
root 26663 25954 0 19:44 pts/4 00:00:00 grep mail

So the email I’m trying to send is a yahoo.com email and I can see the b.mx.mail.yahoo.com email in the list but it never goes away and the mail never arrives at the yahoo.com account.

I’m not sure what I need to do. I dont need any incoming email (yet). Can anyone give me some pointers.

Thanks.