MxToolbox is a broad email diagnostics platform. Generator Labs is purpose-built for continuous reputation monitoring with pay-as-you-go pricing, specialized phishing and threat-intelligence coverage, and free public diagnostic tools at mrdns.com.
MxToolbox built its reputation on free, on-demand diagnostics: a one-shot blacklist check, an MX record lookup, an SPF parser. Useful tools, used by millions. Their Delivery Center product layers continuous monitoring on top of that diagnostic foundation, bundled with deliverability reporting, alerting, and a paid REST API.
Generator Labs takes a narrower scope by design. We focus on continuous reputation monitoring: checking your IPs and domains against the blacklists, threat-intelligence feeds, and reputation systems that affect deliverability, with usage-based pricing and a free tier on the API.
Where the two services compare directly on continuous blacklist monitoring.
| Feature | Generator Labs | MxToolbox |
|---|---|---|
| Free tier | 1 host monitored continuously, no time limit | 1 free monitor, top blacklists only |
| Data sources monitored | Hundreds, including Spamhaus, Barracuda, SORBS, SURBL, threat intelligence, PhishTank, and Microsoft SNDS | Over 100 DNS-based blacklists (vendor-stated), plus Microsoft SNDS |
| Pay-per-check (variable usage) | Yes, Ultimate plan | No, fixed monthly subscription |
| PhishTank phishing-feed monitoring | Yes, dedicated monitor type | Not in published feature list |
| Alert channels | Email, SMS, Slack, Discord, Telegram, PagerDuty, webhooks | Email, SMS |
| REST API | Full coverage with PHP, Node.js, Python SDKs | Yes, paid plans (transaction-limited) |
Comparison reflects publicly documented features as of the page date. Verify current details on each provider site before making a final decision.
The reasons we hear most often from infrastructure teams comparing the two.
A free tier for the first host, fixed monthly plans for predictable workloads, and pay-per-check Ultimate pricing when usage is variable. No minimums, no per-seat fees.
Beyond traditional DNSBLs, Generator Labs monitors PhishTank for phishing-database listings against your domains and integrates threat-intelligence feeds for IPs, domains, and URLs flagged across the security industry.
Email, SMS, Slack, Discord, Telegram, PagerDuty, and arbitrary webhooks. Configure escalation by host, profile, or alert type. No more triaging RBL listings from a separate dashboard.
Every UI action is API-callable on every plan, including the free tier. Add hosts during deployment, query check history from your SIEM, trigger manual checks from a chat command. SDKs for PHP, Node.js, and Python.
Sister site mrdns.com offers free DNS, network, email, and certificate diagnostic tools (blacklist check, SSL check, DMARC checker, MTA-STS validator, and more) with no rate limits or sign-up.
Listings are cross-checked from multiple network locations to filter out false positives from regional resolver issues. Anti-flapping logic prevents alert fatigue from sources that intermittently list and delist the same host.
MxToolbox is a broad email diagnostics platform; their Delivery Center product adds continuous monitoring to a toolkit built around one-off lookups. Generator Labs is monitoring-first, with pay-as-you-go pricing, specialized coverage of phishing and threat-intelligence feeds, and a free tier of public diagnostic tools at mrdns.com.
For most teams, yes. We offer a free tier for one host indefinitely, fixed monthly plans for predictable usage, and a pay-per-check Ultimate plan for variable workloads. There are no minimum commitments and no per-seat fees. See the pricing page for current rates.
Yes. Generator Labs monitors IPv4 and IPv6 addresses against IP-based blacklists, and domains against URIBLs (URI blacklists used to flag spam content). Coverage spans hundreds of data sources including Spamhaus, Barracuda, SORBS, SURBL, and threat intelligence feeds.
Yes. The full feature set is available through a REST API with PHP, Node.js, and Python SDKs. Add hosts, configure profiles, query check history, and receive webhook callbacks on listings. Documentation is at docs.generatorlabs.com.
You can import a list of hosts via the bulk-import tool or the API. We do not import historical check data from other providers, but new monitoring starts immediately and history accumulates from the moment your first check runs.
Set up monitoring for your first host in under five minutes. No credit card required for the free tier.