britney:

Detecting duplicate values in a file is a commonly asked question. Read perldoc perlfaq4 to get information on that (It's pretty easy: you just use a hash as a notepad to record all the values you've seen. So when you read each record from the file, you check the notepad to see if the value is already there.) As for creating and sending the EMail, I used to use MIME::Lite.

...roboticus

When your only tool is a hammer, all problems look like your thumb.