These four tools solve three different problems, not one. Bouncer checks a list before you ever hit send, Warmy.io and MailReach warm up a new inbox or domain so your messages don't land in spam in the first place, and GlockApps tests where mail actually lands afterward and keeps watching your DMARC reports and blacklist status. Bouncer also sells its own Deliverability Kit, a separate monthly subscription from $25/mo covering inbox placement tests, SPF/DKIM/DMARC checks and blacklist monitoring, for buyers who'd rather get that from the same vendor instead of adding GlockApps. None of the four replaces another, and the real difference between them shows up in what each one meters and charges for: a verification credit, a mailbox connected, or a spam-test run against a seed list.
ToolsGavel's top pick: Bouncer (4.4/5, from $8 for 1,000 credits) — Bouncer checks a list for invalid, risky and role-based addresses before you ever send to it, priced per verification credit, either as pay-as-you-go packs or a discounted monthly plan: $8 for 1,000 credits, down to $0.002 each at 1 million, and credits never expire. A free 100-credit allotment needs no card to start, and a separate Deliverability Kit subscription (from $25/mo) bundles placement, blacklist, SPF/DKIM and DMARC testing if you want that covered from the same vendor. G2 (4.8/5, roughly 330-plus reviews) and Capterra (4.9/5, 278 reviews) both rate it highly. The catch: Capterra reviewers call it pricey for small businesses and startups, and the interface draws recurring 'dated' complaints despite the strong scores.
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Bouncer Best for list verification ★★★★★ ★★★★★ 4.4
Bouncer checks a list for invalid, risky and role-based addresses before you ever send to it, priced per verification credit, either as pay-as-you-go packs or a discounted monthly plan: $8 for 1,000 credits, down to $0.002 each at 1 million, and credits never expire. A free 100-credit allotment needs no card to start, and a separate Deliverability Kit subscription (from $25/mo) bundles placement, blacklist, SPF/DKIM and DMARC testing if you want that covered from the same vendor. G2 (4.8/5, roughly 330-plus reviews) and Capterra (4.9/5, 278 reviews) both rate it highly. The catch: Capterra reviewers call it pricey for small businesses and startups, and the interface draws recurring 'dated' complaints despite the strong scores.
Best for: Teams that want to verify a list before sending, either as one-off credit packs or a monthly plan, and who also want blacklist and DMARC testing available from the same vendor · from $8 for 1,000 credits
Deal 10% off pay-as-you-go email verification credits Applied automatically when you sign up through our link. No code needed.
Verified Nov 2026
Choosing between them
These four answer three different questions, not one.
Bouncer answers “is this list safe to send to.” It’s $8 for 1,000 verification credits that never expire, pay-as-you-go or on a discounted monthly plan, and a free 100-credit allotment needs no card. A separate Deliverability Kit subscription, starting at $25/mo, bundles inbox placement and blacklist/DMARC testing if you want that from the same vendor instead of a dedicated tool. The catch: price is the most-tagged complaint on G2 (15 reviews), from users who find it relatively expensive compared to other options.
GlockApps answers “where does my mail actually land, and is my DMARC setup holding up.” It’s the only tool here with a real standing free plan, not a trial, and the highest DMARC-message ceiling in the guide at 12,000,000 a month on its $129/mo Enterprise tier. The catch: its G2 score is reported anywhere from 3.7 to 4.6 depending on the source, and two separate G2 reviewers describe a steep post-signup price hike and an identity-verification demand before GlockApps would approve a plan upgrade.
Warmy.io answers “I want the best-reviewed dedicated warm-up tool, and I’ll book a sales call to get the real price.” It posts the strongest combined G2 and Capterra scores of any single-purpose warm-up tool checked here. The catch: public pricing went sales-gated around May 2026, and reviewers describe a documented pattern of the warm-up sequence silently stopping while billing kept running.
MailReach answers “I want warm-up with a real price on the page, today, no call required.” $25 per mailbox a month, or $20 annually, published directly, with spam-test credits bundled in. The catch: a specific billing complaint describes being re-charged after cancellation, and its own placement-health dashboard reportedly hasn’t always matched real campaign results.
| Tool | Stack step | Cheapest paid price | Metering unit | Free plan / trial | Ratings (G2 / Capterra) |
|---|
| Bouncer | Verify the list, or add its Deliverability Kit (inbox placement, SPF/DKIM/DMARC, blacklist monitoring) from $25/mo | $8 for 1,000 credits, pay-as-you-go or monthly | Per verification credit, never expires | 100 free credits, no card | 4.8/5 (339) / 4.9/5 (278) |
| GlockApps | Test placement + monitor DMARC/blacklists | $59/mo (Essential) | Spam-test credit (placement) + DMARC message volume (monitoring), two separate units | Standing free plan: 2 tests + 10,000 DMARC msgs/mo, no card | 3.7-4.6/5 (range, count unconfirmed) / 4.8/5 (40) |
| Warmy.io | Warm up inboxes/domains | ”From $49/mo,” real rate behind a demo call | Per mailbox connected, volume-based | 7-day trial, no card; no standing free plan | 4.8/5 (503-522) / 4.8-4.9/5 (54-55) |
| MailReach | Warm up inboxes/domains + spam testing | $20/mo per mailbox, billed annually ($25 monthly) | Per mailbox connected | No standing free plan; a time-limited 20%-off promo instead, card requirement unconfirmed | 4.7/5 (44) / 5.0/5 (24, small sample) |
Two things to notice in that table. First, Bouncer and GlockApps both bill their placement-testing side per “test” or “credit,” but GlockApps’s DMARC monitoring bills on a completely different axis, message volume, so a side-by-side on that row alone isn’t apples to apples. Second, Warmy.io and MailReach both bill per mailbox connected rather than per email sent, and MailReach’s $20-$25 entry rate lands close to Warmy’s quoted $49 floor, but Warmy’s real per-mailbox price is hidden behind a sales call, so a direct comparison isn’t possible without booking one.
How we picked
Every price, limit and review score in this guide came from each vendor’s own pricing page, checked directly on 2026-11-06, cross-referenced against G2, Capterra and Trustpilot. G2 blocked direct access on every tool here on every attempt; where that happened, we used an independent search pass and labeled the figure as approximate, or as a range where sources disagreed, rather than picking the most flattering number. GlockApps’s two named upgrade-friction complaints came from individual G2 reviewers, not a documented company policy, and are reported as such.
Our pick
There’s no single best tool here because the four solve three different problems. Bouncer is the strongest pick for the first job, verifying a list before you ever touch warm-up or placement testing, at the lowest realistic cost of entry we found. GlockApps is the deeper placement and DMARC specialist once a list is clean and an inbox is warm, as long as you read the pricing and upgrade complaints first. Warmy.io and MailReach both handle warm-up: pick Warmy if the strongest review track record matters more to you than seeing a real price before a sales call, and pick MailReach if you want that price on the page today and can live with a smaller review sample. Most buyers running real volume will end up pairing one verification tool with one warm-up tool, not buying all four.
Deals & price changes
Price changes and deals for email deliverability tools
One short email when a tool in this guide changes its price or gets a verified deal. At most once a week.
Frequently asked questions
What's the difference between email verification, warm-up, and deliverability testing?
Verification checks a list of addresses you already have and removes invalid, risky or role-based ones before you send to it, Bouncer's core job. Warm-up builds sending reputation for a new mailbox or domain by simulating real activity before real campaigns start, what Warmy.io and MailReach do. Deliverability testing checks where a message actually lands once you do send, inbox, spam or nowhere, and monitors DMARC reports and blacklist status going forward, GlockApps's core job. A buyer running real volume typically needs one tool from the first job and one from the second or third, not all four.
Do I need all four of these tools?
Almost never. The common pairing is one verification tool plus one warm-up tool: Bouncer to clean the list, then Warmy.io or MailReach to warm the sending mailbox. GlockApps is worth adding on top if you specifically want deeper, ongoing placement and DMARC monitoring than your sender or warm-up tool already gives you, not as a default fourth purchase.
Is inbox warm-up already included in my cold email sender?
Often, yes. Smartlead, Saleshandy, Instantly and lemlist all bundle some form of warm-up into their own plans at no extra charge, per our cold email software guide. Warmy.io and MailReach only earn their keep as a second line item if you want deeper diagnostics than that built-in warm-up provides, or if your sender doesn't include one at all.
Which of these four has the cheapest entry price?
Bouncer, by a wide margin, for its core job: $8 for 1,000 verification credits, pay-as-you-go, with no subscription required (a discounted monthly plan is there if your volume is steady) and credits that never expire. Among the two warm-up tools, MailReach publishes a lower, fully transparent entry rate ($20 to $25 per mailbox a month) than Warmy.io, whose real per-mailbox price is now hidden behind a demo call.
