making a list matching certain criteria in bash...

Hello everyone!I am trying to make a mail list(a simple .txt file)in which i put certain records that match specific criteria.
Let's say that i have a(sorted by last column file)like this one:

0100567 Bla1 Lala1 100
1234567 Bla2 Lala2 80
8769029 Bla3 Lala3 70
1001007 Bla4 Lala4 10

What i need to do is to redirect the whole first line in the mail list file.If I had another record with '100' in the 4th column,that should enter the mail list too...So you understand that records that enter that mail list are only those who have the highest number in the 4th column(not every time '100',only in this example).
There is no way(and no need) to know the numbers in that last column,the only thing i know is that they are sorted from high to low.

//Nevermind solved it

//if anyone answers this,please tell me how i can send mail from that list...