====== Why can't I send mails to AOL? ======
Some people reported to have problems sending mails to people at AOL. AOL has a spamfilter on port 25 blocking all requests to send mail over that port. So we've to change a view settings in postfix to let him try to send over port 587. Please open **/etc/postfix/master.cf** and comment out the following line:

<code>
submission inet n - - - - smtpd
</code>
Now run
<cli>
# /etc/init.d/postfix reload
</cli>
Done!

Test it from another host or a windows box via telnet. 
<cli>
# telnet your-server.tld 25
</cli>
Quit with simply typing ''quit'' if connected.
<cli>
# telnet your-server.tld 587
</cli>
If you can connect to both ports all went fine.