We have several websites on which visitors can sign up for various things, such as newsletters, warranty registration, etc. The sites use a php sendmail script to send out those emails/confirmation emails. The issue we are having is that for some reason, our webserver IP address is being reported as a spammer with CBL. How can I prevent this from happening?
Additionally, we have two mail domains. Our main one is @acme.net, however we have recently started using @acme.com as well. Email sent to a user at either address will go to the same mailbox. We are properly setup with Reverse DNS, etc. with the @acme.net domain, but not with the @acme.com one. How do I go about setting up the @acme.com with proper reverse DNS, etc?
The mail being sent from the webserver is using a @acme.com address, so I don't know if that is a contributing factor to the issue. Your help is appreciated - thanks.