7 MxToolbox Alternatives That Actually Solve Your Deliverability Problem
Your bounce rate just spiked to 12%. You're on two Spamhaus blocklists. You pull up MxToolbox, run the free blacklist check, and... now what? MxToolbox tells you that you have a problem. It doesn't fix it.
The moment you need more than one monitor or a single domain, you're staring at Delivery Center pricing that MxToolbox doesn't publish on their site. The numbers you'll see cited most often are around $129/mo for Delivery Center and around $399/mo for Delivery Center Plus. If you're evaluating alternatives, you deserve actual numbers.
Here's the thing: MxToolbox's free DNS lookup tools are genuinely useful. We've used them for years. The problem is everything around them. The free tier caps you at one monitor covering the top 30 blacklists for a single domain. On Trustpilot (3.7/5 across 18 reviews), the pattern is clear - users love the free DNS tools but get burned by the billing experience. Complaints about charges after supposed free trials, difficulty cancelling, and unresponsive support come up repeatedly. The tool itself has gaps too: no inbox placement testing, no email verification, and some users report DKIM false negatives that undermine trust in the diagnostics.
Our Top Picks (TL;DR)
| Pick | Best For | Starting Price |
|---|---|---|
| Prospeo | Email verification - prevent bounces before they happen | Free (75/mo), ~$0.01/email paid |
| GlockApps | Inbox placement testing (Gmail, Outlook, Yahoo) | Free, paid from $59/mo |
| EasyDMARC | DMARC deployment and enforcement | Free, paid from $44.99/mo |
Budget stack: Google Postmaster Tools (free) + MxToolbox free tier for DNS lookups + a free verification tier for list hygiene. Costs nothing and covers more ground than MxToolbox alone.
All 7 Tools Compared
| Tool | Best For | Starting Price | Free Plan | Differentiator |
|---|---|---|---|---|
| Prospeo | Email verification | ~$0.01/email | Yes (75/mo) | Prevents bounces at source |
| GlockApps | Inbox placement | $59/mo | Yes (2 tests) | Tests real inbox landing |
| EasyDMARC | DMARC management | $44.99/mo | Yes (1 domain) | Guided DMARC enforcement |
| dmarcian | DMARC analytics | $24/mo | Yes (2 domains) | Transparent pricing |
| MailReach | Email warmup | $25/inbox/mo | No | Cold email reputation repair |
| MailerCheck | Verification + content | $0.01/credit | 10 free credits | Credits never expire |
| Google Postmaster | Domain reputation | Free | N/A | Gmail-specific insights |
MxToolbox shows you blacklist problems after the damage is done. Prospeo's 5-step verification catches invalid emails, spam traps, and honeypots before you hit send - at 98% accuracy across 143M+ verified addresses.
Drop your bounce rate below 4% like Meritt did. Start free.
Best MxToolbox Alternatives in 2026
Prospeo
Every other tool on this list monitors or diagnoses deliverability problems after they happen. Prospeo prevents them. Bad contact data - invalid emails, spam traps, catch-all domains - is the #1 cause of bounces and blacklistings.
The platform runs a 5-step verification process across 143M+ verified emails, with catch-all handling, spam-trap removal, and honeypot filtering baked in. Email accuracy sits at 98%. You can verify in bulk via CSV, through the API (92% match rate), or with the Chrome extension that 40,000+ users already rely on. Native integrations push clean data into Salesforce, HubSpot, Smartlead, Instantly, and Lemlist. One of our customers, Meritt, saw their bounce rate drop from 35% to under 4% after switching to Prospeo for list verification - and their pipeline tripled from $100K to $300K per week.
Pricing is dead simple: the free tier gives you 75 verifications plus 100 Chrome extension credits per month. Paid plans run about $0.01 per email. No contracts, no annual commitments.
Use this if: You're running cold outreach and your bounce rate is destroying your sender reputation. Cleaning your list before sending is cheaper than rebuilding domain trust after the damage.
Skip this if: You only need DNS diagnostics or DMARC reporting - pair Prospeo with a DMARC tool for full coverage.
GlockApps
MxToolbox can tell you your SPF record is valid. GlockApps tells you whether your emails actually land in the inbox, the spam folder, or the Promotions tab - across Gmail, Outlook, Yahoo, and multiple other providers.
Pricing is straightforward: Free (2 spam tests), Essential ($59/mo, 360 tests), Growth ($99/mo, 1,080 tests), Enterprise ($129/mo, 1,800 tests). Annual billing saves 30%. DMARC analytics come included with every paid plan, with message volume allowances scaling from 10,000 to 12,000,000 per month depending on tier. Exceed your DMARC volume and overages run $7.50, $5, or $2 per 100K messages depending on your plan. You also get IP reputation monitors (up to 25 on Enterprise) and sending-account limits that scale by tier (up to 20 on Enterprise).
Use this if: You need to know where emails land, not just whether DNS records are configured correctly. Essential for email marketers and outbound teams running high volume.
Skip this if: You only need authentication checks. GlockApps is overkill for DNS lookups - MxToolbox's free tools handle that fine.
EasyDMARC
If your problem is DMARC deployment and enforcement - not just monitoring - EasyDMARC is the most polished option in this space. The platform walks you through getting to a DMARC reject policy with guided recommendations based on your compliance rate and email volumes.
Pricing starts at $44.99/mo for Plus (2 domains, starting from 100K emails/mo, 3 months history) and $89.99/mo for Premium (4 domains, 1 year history, TLS reports, dedicated CS manager on annual plans). Annual billing drops those to $35.99 and $71.99 respectively. The free plan covers 1 domain with 1,000 emails/mo and 14 days of history - enough to evaluate, not enough for production. One catch: exceed your email volume and you lose dashboard access until you upgrade.
EasyDMARC also runs an MSP program with ConnectWise, HaloPSA, SyncroMSP, Acronis, and Autotask PSA integrations, plus white-label reporting and 3 years of data history. It's the strongest multi-tenant DMARC option for managing client domains.
Use this if: You're deploying or enforcing DMARC across multiple domains and want guided recommendations, not just raw reports.
Skip this if: You need inbox placement testing - EasyDMARC doesn't do that.
dmarcian
dmarcian has the most transparent pricing in the DMARC space, which matters when so many vendors hide numbers behind "contact sales" buttons. The pricing page lays it all out: Personal ($0/mo, 2 domains, 1,250 messages), Basic ($24/mo or $19.99 billed yearly, 2 domains, 100K messages), Plus ($240/mo, 8 domains, 1M messages), Enterprise ($600/mo, 15 domains, 5M messages). Thirty-day trial, no credit card.
For the DMARC-only use case, dmarcian and EasyDMARC are the two serious options. dmarcian wins on pricing transparency; EasyDMARC wins on MSP features and guided enforcement workflows.
MailReach
MailReach occupies a specific niche: cold email warmup and inbox placement repair. At $25/inbox/month with volume discounts down to $15.60, it's designed for outbound teams whose sending accounts have landed in spam and need to rebuild reputation through automated warm-up conversations. It isn't a diagnostic tool - it's a recovery tool.
Let's be honest: if your cold email deliverability is tanking, the problem is almost never your DMARC configuration. It's either bad data (you're emailing invalid addresses) or cold reputation (you haven't warmed up the inbox). MailReach fixes the second problem. Verification fixes the first. Most teams need both before they need better monitoring.
MailerCheck
MailerCheck bundles email verification, inbox placement testing, and email content analysis - HTML errors, spam triggers, broken links - into a credit-based system. One credit costs $0.01 with a 1,000 minimum purchase. One verification uses 1 credit. One inbox placement test uses 200 credits ($2). Credits never expire, which makes MailerCheck a solid option for teams with irregular sending patterns who don't want a monthly subscription burning in the background.
Google Postmaster Tools
Free, no paid tier, and conspicuously absent from most competitor roundups. Google Postmaster Tools shows your domain reputation, spam rate, and authentication results specifically for Gmail. It won't replace MxToolbox's DNS diagnostics, but for monitoring how Gmail treats your sending domain, nothing else is this direct and this free. Given that Google's updated sender requirements now enforce DMARC alignment for bulk senders, Postmaster Tools isn't optional anymore - it's table stakes.
Your Problem Is Probably Your Data
Look, most teams are focused on the wrong layer. They want better monitoring, better DMARC dashboards, better inbox placement reports. Those matter. But they're treating symptoms.
The root cause of most deliverability problems is bad data. You send to an invalid email, it bounces. Enough bounces and you hit a blocklist. Your domain reputation tanks. Now even your valid emails land in spam. In our experience working with outbound teams, the ones with the worst deliverability problems almost always have a data quality issue, not an authentication issue - and the fix is verification before sending, not better dashboards after the damage is done.
Only about 5.4% of domains have DMARC enforcement enabled, and monthly DMARC record additions have doubled from roughly 55K/month to 110K. Authentication adoption is growing, but it doesn't help if the emails you're sending to don't exist. Monitoring tells you what happened. Verification prevents it from happening.
The best deliverability stack starts with clean data. Prospeo verifies emails at $0.01 each with catch-all handling and spam-trap removal - no contracts, no hidden billing surprises like the ones MxToolbox users keep reporting.
Fix the root cause of blacklistings, not just the symptoms.
Which Tool for Which Job
Not everyone needs the same stack.
Sysadmin managing DNS and authentication: MxToolbox free tier for lookups + dmarcian or EasyDMARC for DMARC enforcement. You don't need inbox placement testing.
Cold outreach SDR or agency: Verification for list hygiene + MailReach for warmup + GlockApps for placement testing. This is the full-stack approach to keeping your domains clean.
Email marketer running newsletters and campaigns: GlockApps for inbox placement + MailerCheck for content analysis and list hygiene. You care about where emails land and why.
MSP managing client domains: EasyDMARC's MSP program or dmarcian Plus/Enterprise. Multi-tenant management with PSA integrations is the deciding factor here.
FAQ
Is MxToolbox free?
The DNS lookup, blacklist check, and SMTP diagnostic tools are free. Free users get one monitor covering 30 blacklists for one domain. The Delivery Center - which adds DMARC analytics and deliverability diagnostics - is paid. Expect around $129/mo for the base tier and $399/mo for Plus, though MxToolbox doesn't publish these prices publicly.
What's the best free alternative?
Google Postmaster Tools is completely free and shows domain reputation, spam rate, and authentication results for Gmail. For DMARC monitoring, dmarcian's Personal plan covers 2 domains at no cost. For email verification, Prospeo's free tier gives you 75 verifications per month - enough to clean a small list before every campaign.
Do I need multiple tools to replace MxToolbox?
Yes, in most cases. MxToolbox bundles DNS diagnostics, blacklist monitoring, and DMARC analytics into one platform. Most alternatives specialize. A typical replacement stack is two or three tools: one for authentication/DMARC, one for inbox placement testing, and one for email verification.
Is MxToolbox Delivery Center worth $129/mo?
At that price, it's hard to justify. GlockApps Essential ($59/mo) delivers superior inbox placement testing, dmarcian Basic ($24/mo) covers DMARC analytics with transparent pricing, and you still have budget left for verification. The only argument for Delivery Center is consolidation - one vendor, one login. But you pay a premium for that convenience, and the specialized tools outperform it at each individual job.