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From http://www.inquiry.com/techtips/java_pro/index.html:

Q & A - Writing applet to send info from forms to email address
Applies to These Versions	Categories	
Version Numbers Not Applicable 	Applets 	
I am wondering if I can write an applet that will send information from a
number of forms to my email address without all the %$= etc. and without
using CGI scripts (my server doesn't allow CGI scripts). 
If the SMTP port (25) on your web server hasn't been disabled by the system
administrator, you can open a socket to it and mimic the SMTP protocol.
Let's say your host is www.sun.com: 
Socket s = new Socket("www.sun.com", 25);
   PrintStream out = newPrintStream(s.getOutputStream());
Then send the string: 
 HELO xxx
   MAIL FROM: yyy
   RCPT TO: baker@www.sun.com
   DATA
   


   .
   QUIT
Note the misspelling of "HELO". I've done this on purpose to make the point
that the xxx and yyy can be anything; SMTP doesn't check. Don't miss the
"." on the second-to-last line. 
Written by inquiry.com Staff on on 7/23/97.