General :: Alternative 'cleaner' Solution Instead Of Rewrite

i have the following script which takes as input parameter a webpage and extract the emails from it. The results are correct but i was wondering whether i could rewrite it in a better, 'cleaner' manner. I think my for loop is a bit. primitive and also each email is printed twice

Code:
#!/bin/bash
echo $1
echo "The script starts now."
echo "Hi, $USER!"
wget $1 -O webpage.txt
awk '
{
for (i=1;i<=NF;i++) {
[Code].....