- Don't use an ISP that has a bad reputation when it comes to spam. Doing so may get you blacklisted just because your IP address is part of their allotted subnet.
- Make sure your DNS is properly set up and that you are complying with the RFC rules regarding service configuration.
- Make sure your Reverse DNS configured properly.
- Configure your sender ID records and SPF properly.
- Make sure your mail server is not an open relay.
- Make sure your proxy server is not an open proxy.
- Check that the abuse@yourdomain.tld and postmaster@yourdomain.tld addresses exist and they are functional.
- Do not allow unsolicited ads and other bulk e-mails to be sent from your server, by the hosted accounts.
- Do not run pro spam services like: spam websites, drop mail boxes for replies to spam e-mail ads, DNS for junk mailers, payment processing services for the products advertised in spam messages, junk mail tools (like lists of e-mail addresses).
- Make sure all your hosts are as secure as possible.
- Make sure you do not have any spam bots on your systems.
- Make sure the information provided in the domain registration service (whois) is updated and complete.
- Make sure your mail server does not send poorly-formatted messages.
- Use secured connections (SSL/TLS) as much as possible.
- Do not allow unauthenticated users to send e-mails neither locally nor remotely.
When you feel that your server is correctly configured and spam-safe, you can use one of the open relay testing and DNS testing tools available on the Internet to make sure everything is working as it should.
If any errors are then reported, they should be fixed before taking any server into production.
Also, never forget that there are distributed lists that do not provide any method of removal from the database. In such cases it is best to prevent being added in the first place.
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