I needed a quick way to send some files from the command line when logged into a Solaris server via ssh.
This assumes the server is already configured to deliver your smtp mail. I also used mailx for the sending client.
Here is how I did it, for your geeky reference.
First write your message:
cat << EOF > /tmp/mailmsg<br /> Hi this is a message<br /> And this is the second line<br /> EOF