How do I send email from UNIX machines to a corporate mail ID?

# mail testuser@yahoo.com

At that point you will be prompted for a subject.

Subject: just checking in

Hit the enter key and then type your message hitting enter until you get to your last line, where you are finished. Type in a . (period) in the first column. At that point, you will be prompted as to whether or not you wish to CC: anyone. If you do not, hit enter and that is all there is to it.

On the back-end, your system must be configured to send mail. More then likely you are running sendmail and you don't even know it. Type this in:

# ps –ef | grep sendmail

Obviously, you must also be connected to the Internet. Trying pinging a web-site;

# ping www.oracle.com.

If you see a response, that should tell you that you are connected. If not, you'll need to work with your network and/or security team to determine…

Mail and mailx are very similar; if you're working on a Solaris system, you should use mailx instead.