Anyone running a shared hosting server is probably now accustomed to dealing with constant complaints about blacklisting. It’s exim’s default setup on a cPanel server to use the shared IP of the server to send email, which means that all your clients on one server are sending out email on the same IP. All it takes is for one spammer to send out a mailing list or one customer to get hacked and run a Darkmailer script, and suddenly everyone on your server seems to be complaining about getting their mail bounced.
You can change the server’s IP address for sending email. Assuming you already have an IP set up on your server with a valid PTR, you probably already saw on the cPanel forums or some other location that you can simply change the interface lines in your /etc/exim.conf file and restart exim: (more…)