MX Guarddog
Cloud-hosted spam and virus filtering for your domain
What is MX Guarddog?
MX Guarddog is a cloud-hosted email security service that protects your domain from spam, viruses, malware, and phishing attacks. Operating since 2006, MX Guarddog scans all incoming email before it reaches your mail server, quarantining threats and delivering only clean messages to your inbox.
With no software to install and no changes required to your email clients, MX Guarddog works with any email system - whether you're using cPanel hosting, Microsoft 365, Google Workspace, or your own mail server.
How It Works
Email sent to your domain
MX Guarddog scans for threats
Spam held in quarantine
Clean mail delivered to you
Key Features
Collective Intelligence
Powered by millions of email addresses, MX Guarddog's distributed detection systems identify and block spam faster than traditional filtering methods.
Anti-Virus Protection
Scans all attachments for viruses, malware, and ransomware before they reach your inbox. Includes image scanning for threats embedded in PDFs.
Phishing Protection
Detects and blocks phishing attempts using SPF verification, URL blocklists, and advanced heuristics to protect against email fraud.
Quarantine Reports
Users receive regular email reports showing quarantined messages. Review and release legitimate mail directly from the report - no login required.
Country Blocking
Block email from specific countries you don't do business with. One of the most powerful ways to reduce spam volume.
TLS Encryption
Secure email transmission with Transport Layer Security (TLS) encryption, including Perfect Forward Secrecy (PFS) for maximum security.
Mail Spooling
If your mail server goes offline, MX Guarddog holds your email and automatically delivers it when your server comes back online.
Easy Integration
Automatic sync with cPanel, Active Directory, LDAP, and more. Simply update your MX records and you're protected.
Filtering Technologies
- Distributed IP Reputation Analysis
- Distributed Signature Analysis
- Real-time Blocklists (RBL)
- URL/SURBL Blocklists
- SPF (Sender Policy Framework)
- Greylisting
- Bayesian Fingerprinting
- Image & PDF Scanning
- Reverse DNS Verification
- Attachment Type Blocking
Compatible With
MX Guarddog works with any email system that allows you to modify your domain's MX records:
MX Guarddog
Per domain - covers all email addresses
- Unlimited email addresses
- Spam & virus filtering
- Phishing protection
- Quarantine reports
- TLS encryption
- Mail spooling
No contract - cancel anytime