check that the .com part is there or not.And also put some  
numeric arbit values on the field & then check the 
functionality.

i will go for penetration testing

E-mail address validation

Address = "A@b.c";      	-- Valid
Address = "A@b.cnet"; 	-- Invalid
Address = "A@b.c_";    	-- Invalid
Address = "A@bcnn";          	-- Invalid
Address = "Ab.cnn";            	-- Invalid
Address = "A@bc";             	-- Invalid
Address = "A@bat@.cnn"; 	-- Invalid
Address = "A@bat/.com";  	-- Invalid

Must not be too short and too long.
Only one @ in email address
Only one period ’.’or two periods.
No more than 3 characters after the final period (reverse 
find is 0 based not 1 based)com/ org/net/mil/gov
Should not have an underscrode after @ 
Allowed characters 0-9 A-Z _. @-

Byeee Friends
Rajendra
rajendra_penumalli@yahoo.com

There are many validation for E-mail here i am defining some
of them.
Email format: vishal.bilgaiyan @ gmail.com
              |______________||_||___| |___|
                  (1)         (2)  (3)  (4)
I have devided Email ID in 4 parts..
In first part we have to check invalid condition input
spaces, Left blank, use special character, symbols etc.

In Second part we have to check invalid condition input
other specail character [!#$%^&*()_-:;"'?/|\) at the place
of @. left thisfield as blank. input spaces.etc.

In third part we have to check invalid invalid domain.

In fourth part we have to check only valid
suffix(.com,.co.in,.edu,.info,.org,.in etc)

every time EmailID should be in well manner.
like vishal.bilgaiyan@gmail.com

Let me know if you have any problem regarding this issue.

Thanks to all of u...
bye

public boolean isValidEmailID(String emailID)
{
   boolean valid = false;
   if (emailID)!= null)
   {
     Pattern p = Pattern.compile(".+@.+\\[a-z]+") 
     Matcher m = p.matcher(emailID);
     valid = m.matches();
   }
   return valid;
}