There are several ways to prevent an SMTP server from being considered a spammer:
1. Use authenticated SMTP: Make sure that your server requires authentication for sending emails. This will prevent unauthorized users from using your email server to send spam.
1. Implement message validation techniques: Implement techniques like SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail), and DMARC (Domain-based Message Authentication, Reporting, and Conformance), which validate the authenticity of emails and ensure that they are not forged.
1. Monitor email traffic: Monitor your email traffic and look for signs of spamming. If you notice any suspicious activity, take immediate action to investigate and stop it.
1. Manage mail queues: Make sure that your mail queue is not flooded with spam emails. Set up rules to limit the number of emails that can be sent from your server in a given period.
1. Use IP reputation services: Use IP reputation services to check the reputation of your server’s IP address. If your IP address is blacklisted, take steps to get it delisted as soon as possible.
1. Educate users: Educate your users about the dangers of spamming and what they can do to prevent it. Train them on how to spot phishing emails and how to report them.
