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Block a Spammy Domain using Spam Filters in DirectAdmin

Are you tired of spam emails flooding your inbox? Especially from the same domain or unfamiliar email addresses? DirectAdmin provides a straightforward and efficient method for filtering out unwanted emails through its built-in spam filters.

This lets us block an entire domain, a specific email address, certain keywords, or even emails above a certain size. DirectAdmin makes it easy.

Here’s a step-by-step guide to help you clean up your inbox.

Block Emails by Domain

If you’re receiving spam from random users under the same domain (like `@example.com`), here’s how you can block that entire domain:

1. First, log in to the DirectAdmin account.
2. Go to the E-mail Manager section and click on Spam Filters.
3. Under Block By, select Domain from the dropdown menu.
4. In the Value field, enter the domain name (without `http://` or `www`).
5. Click Block.
6. Repeat steps 3–5 to block additional domains.

If you’re also managing PHP applications, it might be useful to understand how open_basedir restrictions in DirectAdmin can affect the way scripts interact with your file system—especially when filtering or scanning attachments.

Block Specific Email Addresses

Want to stop emails from a particular sender? Use this method:

1. Log in to your DirectAdmin account.
2. Head to E-mail Manager > Spam Filters.
3. Under Block By, choose E-mail.
4. Enter the full email address (e.g., `spam@example.com`) in the Value field.
5. Click Block.
6. Repeat steps 3–5 to block more individual email addresses.

For developers automating spam checks or routine inbox cleanups, setting up a DirectAdmin cron job to run a PHP script can be a powerful way to streamline your filtering tasks.

Advanced Filtering Options in DirectAdmin

DirectAdmin also allows you to block spam emails using other useful criteria:

1. Log in to your DirectAdmin account.
2. Then, go to E-mail Manager > Spam Filters.
3. Choose a filtering option under Block By:
   • E-mail – Block specific email addresses.
   • Domain – Block entire domains.
   • Stop word – Block emails containing specific keywords.
   • Size – Block emails larger than a specified size.
4. Fill in the Value field based on your selection.
5. Click Block.

You’ll see a confirmation message like “Filter Set” once the filter is successfully applied.

To strengthen isolation between users and limit the effects of spam or malicious content, you might consider enabling Bubblewrap jail in DirectAdmin. It is a containerized security mechanism to keep system-wide spam or vulnerabilities at bay.

Enable Adult Content Filtering

To block emails containing adult content or explicit phrases:

1. In the Spam Filters section, look for Options.
2. Check the box to Enable Adult Filter.
3. You’ll receive a message saying “Adult filter set.”

This feature automatically blocks messages containing common adult words and phrases.

How to Handle Spam Emails

Under Options, we can also define what happens to filtered emails:

• Drop E-mail – Completely discard the message.
• Send to spambox – Redirect the message to the spam/junk folder.

Once selected, you’ll see a message like “Filter action saved.”

[Need assistance with a different issue? Our team is available 24/7.]

Conclusion

DirectAdmin’s spam filter is a powerful tool to keep your inbox clean and your digital life more secure. We can block annoying spam, protect against phishing, or reduce inbox clutter with these settings.

In brief, our Support Experts demonstrated how to block a spammy domain using Spam Filters in DirectAdmin.