There are several security measures to secure an SMTP server:
1. Authentication configuration: The SMTP server must be configured to require authentication for sending emails. This measure deters hackers from connecting to the server and sending malicious emails.
1. Regular software update: It is very important to keep the SMTP server software up to date to avoid security breaches.
1. Hardening security rules: It is possible to harden SMTP server security rules to block password attacks, malicious code insertion attacks, brute force attacks, session spoofing attacks , etc.
1. Setting up filtering: A filtering system can be set up to block spam. Filtering is often based on rules that allow spam to be blocked based on certain characteristics, such as content, sender addresses or domain names.
1. Using an SMTP proxy: Intermediate servers called SMTP proxies can be used to provide an additional level of security by protecting the IP addresses of mail servers.
1. Regular Monitoring: Monitoring tools can be used to monitor SMTP server traffic and detect potential threats.
