Spam filters are used to detect and manage unwanted email before it reaches your inbox.
They automatically analyze incoming messages and decide how they should be handled.

Spam filtering is available on Email Hosting and Web Hosting packages that include email services.

How Spam Filters Work #

Spam filters evaluate incoming emails based on:

• Sender reputation
• Message content
• Technical headers
• Known spam patterns

Each email is given a spam score.
Based on this score, the email may be delivered, moved to a spam folder, or rejected.

Default Spam Filtering Behavior #

By default:

• Spam filtering is enabled
• Most spam is automatically filtered
• Legitimate emails are delivered normally

For most users, default settings are sufficient and should not be changed.

Server-Level vs Inbox-Level Filtering #

Spam filtering works on multiple levels:

Server-Level Filtering #

• Filters email before it reaches the mailbox
• Blocks or tags obvious spam
• Reduces inbox load

Inbox-Level Filtering #

• Managed by webmail or email clients
• Allows marking emails as spam or not spam
• Improves filtering accuracy over time

Both layers work together.

Spam Folder Behavior #

Filtered spam is usually:

• Delivered to a Junk or Spam folder
• Automatically deleted after a retention period

You should review the spam folder occasionally to ensure no legitimate emails were filtered.

Adjusting Spam Filter Settings #

Advanced users may:

• Change spam sensitivity levels
• Enable automatic spam deletion
• Manage allowlists and blocklists

Incorrect adjustments can cause legitimate emails to be lost.

When Not to Change Spam Settings #

Do not change spam filter settings if:

• Email delivery is working correctly
• You are unsure what a setting does
• You rely on default protection

Unnecessary changes often cause more problems than they solve.

Common Issues #

• Legitimate emails marked as spam
• Spam emails reaching the inbox
• Important emails deleted automatically
• Spam folder not checked regularly

Most issues are related to aggressive filtering or missing allowlist entries.

Spam Filters and Email Authentication #

Spam filters work best when:

• SPF, DKIM and DMARC are correctly configured
• DNS records are accurate

Authentication helps spam filters trust your domain.

Responsibility Notice #

You are responsible for:

• Reviewing spam folders
• Managing allowlists and blocklists
• Avoiding overly aggressive settings

ProRedLine does not manually review spam filtering decisions.