MX Guarddog
MX Guarddog is a cloud email gateway for standard SMTP servers used with owned domains.
What MX Guarddog is
MX Guarddog is a cloud email gateway for standard SMTP servers used with owned domains. It scans incoming messages for spam, phishing, malware and viruses, quarantines flagged mail, and forwards clean messages to the customer’s server. It does not support consumer Gmail or Hotmail accounts. As a hosted service, it requires no hardware or software installation and no email-client or server configuration changes. When a customer’s server is unavailable, it can hold mail for up to 168 hours and deliver it after service returns. Users receive quarantine reports and can adjust report preferences; quarantine retention is seven days. The service can sync active addresses from Windows AD, LDAP or cPanel, and says it uses Transport Layer Security, including Perfect Forward Security, for email in transit. Pricing is $0.25 per email address per month, with no charge for aliases; there is also a free option earned through visible MX Guarddog links on a website. A 30-day trial is listed.
Good
- Filters spam, phishing, malware and viruses.
- Holds mail during server outages for up to 168 hours.
- Syncs active addresses from Windows AD, LDAP or cPanel.
- No charge for user or domain aliases.
- No limit on email addresses or messages received.
Watch out
- Does not support consumer Gmail or Hotmail accounts.
- Quarantine retention is seven days.
- Costs $0.25 per email address per month.
- Free service requires visible website links to earn tokens.
Who it suits
It suits organizations, schools, churches, public offices and personal domain owners who use standard SMTP servers for domains they own. It is not intended for consumer Gmail or Hotmail accounts.
Verdict
MX Guarddog combines inbound threat filtering with mail holding during server outages, without requiring local installation or configuration changes. Check that your email setup uses a supported SMTP server and consider the per-address charge when evaluating the paid plan.
Plans and prices
From MX Guarddog's own pricing page, checked 3 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Per Email Address Pricing | $0.25 a month | No limit on email addresses or messages; free user aliases; unlimited quarantine storage · $0.25 per email address, per month; no charge for user aliases or domain aliases. |
The facts
Each one read from MX Guarddog's own pages, with the date it was checked.
What it does
- Account syncing
- MX Guarddog says it can automatically sync active email addresses from Windows AD, LDAP, or cPanel systems.checked 3 Oct 2026
- Email filtering
- MX Guarddog scans incoming email for spam, phishing, malware, and viruses, quarantines offending messages, and forwards clean mail to the customer’s server.checked 3 Oct 2026
- Encryption
- The service says it uses Transport Layer Security encryption, including Perfect Forward Security, for email traveling over the Internet.checked 3 Oct 2026
- Filtering technology
- The company says its servers use mailbox activity to maintain a real-time blocklist that identifies and stops spam.checked 3 Oct 2026
- Hosted service
- The cloud based service requires no hardware or software installation and no configuration changes to email clients or the server.checked 3 Oct 2026
- Intended customers
- The company describes the service as suitable for organizations, schools, churches, police and government offices, and personal domain owners.checked 3 Oct 2026
- Mail outage protection
- If a customer’s server is unavailable, MX Guarddog says it spools mail for up to 168 hours and delivers it when the server is back online.checked 3 Oct 2026
- Quarantine reports
- The service sends users quarantine reports summarizing stopped spam, and users can adjust their report preferences.checked 3 Oct 2026
- Service availability
- The SLA commits to commercially reasonable efforts to maintain at least 99.95% uptime over a trailing 30-day period and offers a service credit if the commitment is missed.checked 3 Oct 2026
- Support
- End users are directed to contact their email administrator, while domain administrators can contact the MX Guarddog postmaster for technical help.checked 3 Oct 2026
Money
- Billing limits
- The pricing page says there is no limit on the number of email addresses or messages a customer can receive.checked 3 Oct 2026
- Free service option
- Customers can earn tokens by placing visible MX Guarddog text links on a website and use those tokens to pay invoices.checked 3 Oct 2026
The company
- Founded
- 2006checked 28 Sep 2026
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