How do you test POSTFIX for sending mail out?

I have Slackware 9 installed with sendmail packages removed and POSTFIX installed. I can receive mail and view it in the queue with the sendmail -bp command. I have only this MTA installed and no pop or Imap setup yet .(forgot the acrynoum for that one)

When I use the command line mail to send mail or to check mail: I have no mail (when I know I do) and I am to send mail but it never reaches its designation. In K-Mail.. I can not send mail with any configuration I choose..

I know PostFix is accepting mail... HOW CAN I TEST SENDING MAIL?

Thanks for your help,
Matthew

If it's not reaching it's destination, you will likely find an error message somewhere. Either from the person you are trying to deliver to (not likely) or a return message to you. Also, read your mail logs /var/log/mail and see what you can find in your system log /var/log/messages. Try sending email as you tail your logs:
tail -f /var/log/messages
And other logs.

Post up your postfix/main.cf so we can see what the setup is like, or post up the result of:
postconf -n (IIRC).

Be sure you try sending to yourself (get a yahoo email account or something to test with) so you can verify the problems.

Cool

Try this:
=>
telnet <IP> 25
EHLO
MAIL FROM: <from-email>
RCPT TO: <recipient-email>
DATA
Type message here.
. <Enter>
=>

The last line leaves DATA mode.