Spam

Sender Policy Framework (SPF) validates emails to prevent spam by minimizing address spoofing, enhancing email filtering for providers like Yahoo and Google.

DKIM (DomainKeys Identified Mail) adds encrypted digital signatures to emails, reducing email spoofing and ensuring message authenticity.

DMARC (Domain-Based Message Authentication, Reporting, and Conformance) DNS record enhances email security by enforcing DKIM and SPF checks, specifying actions for failed checks.

An RBL (remote block list or realtime blackhole list) is a spam-fighting tool that lists spammy IP addresses, affecting both incoming and outgoing emails.

In addition to using a spam filtering program like SpamAssassin, you can use remote block lists (RBLs, also called DNSBLs) to look for spam in your incoming email. RBLs are lists of IP addresses that are associated with spam email. Your server asks an RBL if the email sender IP is on its list of spam addresses. If it is, your server’s settings can reject the message and send it back with an error, accept the message and tag it for further spam filtering, or accept the message and deliver it to your inbox.

Minimize spam by adding custom RBLs in WHM or Plesk. Learn how to add, enable, and test new remote block lists on your server.

There are two potential problems when it comes to using your own mailserver and spam: spam email being sent to your account and spam email being sent from your account. The free program SpamAssassin can reduce how much spam email gets to your inbox. SpamAssassin assigns a score to each email you receive. Then, based on your settings, it rejects email that scores too high. The scoring is from 0 to 10, with 0 having the strictest rules and 10 having the most relaxed rules. It’s like a threshold: if you set the threshold to 5, emails that score 6 or higher will be marked as spam. We generally recommend starting at a threshold of 5, then adjusting as necessary. This article will show you how to enable SpamAssassin on a domain.