Email Deliverability
Best Email Domain Monitoring Tools for Agencies (2026 Comparison)
Comparing the top email domain monitoring tools for agencies managing multiple client domains in 2026. We cover EasyDMARC, MxToolbox, GlockApps, and Infraova.
If you manage email for multiple clients, you already know the problem. One tool catches blacklist issues. Another checks DMARC. A third generates reports. None of them talk to each other, and none of them were built for agencies managing dozens of domains across different clients.
This comparison covers the tools agencies are actually using in 2026, what each one does well, where each one falls short, and which one makes sense depending on how many domains you're managing and what you need from a reporting workflow.
What agencies actually need from a monitoring tool
Before comparing tools, it helps to be specific about what an agency workflow requires because most of these tools were built for single-domain owners, not agencies.
Multi-client hierarchy You need to organize domains by client, not just maintain a flat list. When something breaks on a domain, you need to know which client it belongs to without hunting through a spreadsheet.
Continuous monitoring A tool that runs checks on demand is useful for audits. A tool that runs checks every hour and alerts you when something changes is useful for ongoing client management. These are different products.
White-label reporting Client reports should look like they come from your agency, not from the tool you're using. White-label PDF reports are the difference between looking like a professional service and looking like you forwarded a third-party email.
Coverage breadth Email domain health is more than SPF, DKIM, and DMARC. SSL expiry, blacklist status, registrar lock, nameserver changes, DNSSEC, BIMI, MTA-STS, spoofing detection, DMARC RUA parsing agencies managing high-value client domains need comprehensive coverage, not just the basics.
Pricing that works at scale Per-domain pricing that made sense at 5 domains becomes a significant cost at 50. Agency-oriented plans with domain limits that reflect real workloads matter.
EasyDMARC
EasyDMARC is one of the most recognized names in DMARC monitoring. It's been around since 2018 and has built a solid product around DMARC report parsing and enforcement guidance.
What it does well: EasyDMARC's strength is DMARC. It parses RUA aggregate reports, shows you which sources are sending from your domain, and walks you through the process of moving from p=none to p=reject. If DMARC enforcement is the primary problem you're solving, EasyDMARC is a mature product.
Where it falls short for agencies: EasyDMARC is built around DMARC monitoring, not comprehensive domain health. It doesn't run infrastructure checks like PTR records, registrar lock, or nameserver change detection. Its multi-client organization is limited you're working with a flat domain list, not a client → domain hierarchy. White-label reporting exists on higher tiers but the reports are DMARC-focused, not full domain health reports.
Pricing: Starts around $45/month for basic plans. Agency-appropriate plans with sufficient domain limits run $150–$400/month depending on volume.
Best for: Organizations that specifically need DMARC RUA report parsing and enforcement guidance. Less suitable as a general domain health monitoring platform for agencies.
MxToolbox
MxToolbox is the longest-running name in email diagnostics. Its MxToolbox Monitor product adds continuous monitoring on top of the classic diagnostic tools.
What it does well: MxToolbox's diagnostic breadth is unmatched for one-off lookups. The free tools MX lookup, blacklist check, header analyzer are genuinely useful. MxToolbox Monitor adds alerting when things change.
Where it falls short for agencies: MxToolbox was designed as a diagnostic tool first and a monitoring product second. There's no client hierarchy, limited reporting capability, and white-label output is not a feature. For agencies that need to produce client-facing deliverability reports, MxToolbox isn't the right tool.
Pricing: The free tier is genuinely useful for one-off diagnostics. MxToolbox Monitor starts around $129/month for monitoring at scale.
Best for: Deliverability consultants who need a reliable diagnostic tool for one-off audits and investigations. Not suitable as a primary platform for agencies managing ongoing client relationships.
GlockApps
GlockApps focuses on inbox placement testing sending test emails and reporting where they land across major mailbox providers.
What it does well: Inbox placement testing is something most other tools don't do. GlockApps tells you whether a test email landed in the inbox, spam, or was missing entirely at Gmail, Outlook, Yahoo, and others.
Where it falls short for agencies: GlockApps doesn't run continuous DNS monitoring. It doesn't alert you when a DMARC record changes or a domain hits a blacklist. It doesn't produce comprehensive domain health reports. It's a testing tool, not a monitoring platform.
Pricing: Credit-based pricing starting around $59/month.
Best for: Supplementary inbox placement testing during campaigns or troubleshooting. Not a standalone monitoring solution for agency domain portfolios.
Infraova
Infraova was built specifically for agencies, deliverability consultants, and MSPs managing domain portfolios for multiple clients.
What it does well:
25 checks per domain, every hour the full authentication stack (SPF, DKIM, DMARC, alignment, subdomain DMARC, SPF enforcement, DMARC coverage, SPF record length, DKIM key strength), infrastructure (MX, PTR, Null MX), security (DNSSEC, CAA, DANE/TLSA, registrar lock, nameserver change detection, subdomain lockdown), certificates (SSL, WHOIS/domain age), and advanced checks (MTA-STS, TLS-RPT, BIMI, Google bulk sender compliance).
DMARC RUA report parsing Infraova ingests aggregate reports from Google, Outlook, and other mailbox providers, surfacing pass rates, message counts, and sending source data per domain updated daily.
Spoofing detection tracks spoofing attempts across the last 90 days with reverse DNS lookup on spoofing IPs. If someone is sending email that appears to come from a client's domain, you see it.
DMARC progression tracker visual tracker from p=none → p=quarantine → p=reject with a requirements checklist at each stage per domain.
Gmail Postmaster integration pulls Gmail domain reputation data directly for domains with sufficient sending history.
ESP metrics bounce rate, spam complaint rate, reply rate, and inbox placement tracked per domain alongside infrastructure checks.
Automated 8-page white-label PDF reports generated weekly per client covering: health score, executive summary with blacklist alerts, client health table with 30-day score trends, full domain portfolio with DMARC status, risk matrix, fix plan with business impact and time estimates, per-domain check breakdown with exact DNS fixes, compliance scores (A–F per domain), month-over-month comparison, spoofing source map, sending infrastructure detection, BIMI logo preview, portfolio benchmark, and a client-facing summary for non-technical stakeholders. Reports carry your agency branding.
Domain import from Cloudflare, GoDaddy, Namecheap, Instantly, and Smartlead.
AI advisor per issue every failed check includes a plain-language explanation and fix walkthrough.
Where it falls short: No inbox placement testing GlockApps is the right supplementary tool for that.
Pricing: Agency-oriented pricing with a 7-day free trial, no credit card required.
Best for: Agencies, deliverability consultants, and MSPs managing domain portfolios across multiple clients who need continuous monitoring, client organization, DMARC RUA parsing, and automated white-label reporting.
Side-by-side comparison
| Feature | EasyDMARC | MxToolbox | GlockApps | Infraova | |---|---|---|---|---| | Continuous monitoring | Yes | Yes | No | Yes | | Check frequency | Daily | Variable | On-demand | Hourly | | Checks per domain | ~10 | ~8 | Inbox only | 25 | | Client hierarchy | No | No | No | Yes | | DMARC RUA parsing | Yes | No | No | Yes | | Spoofing detection | Partial | No | No | Yes | | DMARC progression tracker | Yes | No | No | Yes | | Gmail reputation | No | No | No | Yes | | ESP metrics | No | No | No | Yes | | Blacklist monitoring | Yes | Yes | No | Yes | | Security checks (full) | No | No | No | Yes | | Automated PDF reports | No | No | No | Yes (8 pages) | | White-label reports | Partial | No | No | Yes | | Inbox placement testing | No | No | Yes | No | | AI issue advisor | No | No | No | Yes | | Domain import | No | No | No | Yes | | Starting price | ~$45/mo | ~$129/mo | ~$59/mo | Competitive |
Which tool is right for you
If DMARC enforcement is your primary focus: EasyDMARC.
If you need one-off diagnostic tools: MxToolbox. The free tools are excellent for spot-checking.
If you need inbox placement testing: GlockApps.
If you're an agency managing multiple client domains: Infraova. It's the only tool in this list built specifically for that workflow from continuous monitoring and DMARC RUA parsing to spoofing detection, Gmail reputation tracking, and automated client-facing reports.
Most agencies running mature deliverability services use more than one tool. Infraova for continuous monitoring, reporting, and DMARC visibility. GlockApps for inbox placement testing during campaigns. The mistake is trying to make one tool do everything, or using a single-domain tool to manage a multi-client portfolio.