GlockApps vs MailReach: Which Deliverability Tool Do You Actually Need?

Last updated July 2026.

Every few weeks somebody in a sales Slack asks the same question: GlockApps or MailReach? The framing is wrong, and that is why the answers always contradict each other. One person says GlockApps because they had a DMARC mess to untangle. Another says MailReach because they bought fifteen new domains. Both are right, because they had different problems. GlockApps is a measuring instrument. MailReach is a treatment. Figure out whether you have a fever or an infection first.

What is the difference between GlockApps and MailReach?

GlockApps tells you where your email landed and which authentication record is broken. It runs seed-list inbox placement tests, reads your DMARC reports, and watches blacklists. MailReach builds a mailbox's reputation for you: it runs an automated warm-up engine across Google and Outlook inboxes and bundles spam testing on top. Diagnosis versus treatment.

That shows up in the pricing. GlockApps sells credits and monitors, billed per account regardless of how many mailboxes you own. MailReach sells a per-mailbox subscription, because warm-up is something you do to one inbox at a time. Two mailboxes, MailReach is cheap. A 40-mailbox agency setup, and that math gets loud fast.

How much does GlockApps cost?

GlockApps has four tiers, and unusually for this category the free one is genuinely useful. Free gives you 2 spam test credits, 1 sending account, 10,000 DMARC messages, 5 uptime monitors and 1 user. That is enough to diagnose a problem once. Paid plans run $59, $99 and $129 a month, with annual billing cutting 30%.

Two things to notice. The sending-account limit is the real gate, not the price: Essential covers exactly one sending account, so an agency with a dozen client domains lands on Growth or Enterprise whether it wants the extra credits or not. And the DMARC allowances are large. Aggregate reports arrive as XML, and reading them by hand is miserable. Turning that pile into something a human can act on is the strongest thing GlockApps does.

Important: GlockApps does not send campaigns and does not warm up mailboxes. It is a monitoring layer beside your sending stack.

How much does MailReach cost?

MailReach's All-In-One plan (warm-up plus spam tester) is $19.50 per mailbox per month, with 20% off on annual billing. Each mailbox gets automated warm-up across Google and Outlook, warming up to 100 emails per day, a minimum of 20 spam test credits, blacklist and SPF/DKIM/DMARC health checks, a reputation dashboard and an AI deliverability assistant. The spam tester is also sold standalone in credit bundles.

Per-mailbox pricing is the whole story here. It is fair, it is transparent, and it scales linearly, which is fine at small volumes and expensive at large ones:

Do not read those columns as like-for-like. GlockApps at $99 does not warm up ten mailboxes, it lets you test ten sending accounts. ColdMailer at $49 flat sends your campaigns and warms unlimited mailboxes, but gives you no DMARC forensics. Nobody in this table does all three jobs.

MailReach showed a promotional 20% off for the first 30 days rather than a standard free trial, so plan on paying something to evaluate it.

Is GlockApps or MailReach better for cold email?

For a pure cold email operation, MailReach usually gets more day-to-day use, because cold senders constantly spin up fresh mailboxes and fresh mailboxes need warming. GlockApps earns its place the day something goes wrong and you need forensics: a placement drop with no obvious cause, a blacklist listing, DMARC reports nobody can read.

The practical split most teams land on:

• Buy GlockApps if you are the person who has to explain why deliverability moved. The DMARC analytics, multi-provider seed tests and blacklist plus uptime monitoring are a real toolkit, and the free tier is enough to diagnose a single incident without a card.
• Buy MailReach if you have new or burned mailboxes, a sending platform you cannot or will not replace, and a small enough mailbox count that $19.50 each does not compound into a second software budget. The AI assistant naming the exact broken record is a genuine time-saver for people who do not enjoy DNS.
• Buy neither if what you actually need is warm-up plus rotation plus sending in one place. That is a sending platform's job, and paying two vendors to bolt it on is how people end up with a $300 stack that still cannot send an email.

We built ColdMailer for the third case: bring your own SMTP, unlimited mailboxes, smart inbox rotation and automatic domain warm-up included, flat $49 a month on Pro. If you got here from a shortlist, our GlockApps alternative and MailReach alternative pages lay out exactly where each of them still beats us, because on DMARC forensics GlockApps clearly does.

Do I need both a spam tester and a warmup tool?

Usually not, and definitely not forever. A spam tester is a snapshot: it tells you where a specific message landed with a specific seed list at a specific moment. A warm-up tool is an ongoing process that builds sending history. Buying both, from two vendors, on top of a sending platform, is three bills for one outcome.

The real trap is treating either number as the score that matters. Seed-list inbox placement is a proxy. It is a useful proxy, but the number Gmail actually enforces on is the spam rate that real recipients generate, visible in Google Postmaster Tools. Google's published sender guidelines are explicit: keep that spam rate below 0.3%, and ideally below 0.10%. Synthetic warm-up engagement does not offset real complaints. A seed test does not prevent them either. It just tells you afterwards that something is wrong.

So before you buy anything, work out which problem you actually have.

How do I check my email deliverability for free?

Start with the first-party dashboards, because they are free and they are the only ones reading the same signals the mailbox providers act on. Google Postmaster Tools shows your domain reputation and spam rate at Gmail. Microsoft SNDS does the equivalent for Outlook and Hotmail. Add GlockApps' free tier for a couple of seed tests and DMARC parsing when you need a second opinion.

A free stack that covers most of what a paid tool would tell you:

1. Google Postmaster Tools. Verify your sending domain, then watch the spam rate. Below 0.10% is the target Google states. This is the number that matters more than any seed test.
2. Microsoft SNDS. The Outlook side of the picture. Free, and most cold senders never bother setting it up.
3. Your DNS. SPF or DKIM plus TLS for every sender, and SPF, DKIM, DMARC plus one-click unsubscribe if you are pushing 5,000 or more messages a day to Gmail. Publishing correct records costs nothing.
4. GlockApps Free. Two spam test credits and 10,000 DMARC messages is enough to answer "is this a placement problem or an authentication problem?" once.

If those four say you are clean and you still are not landing, the problem has moved from infrastructure to content and targeting. That is covered in more depth in our guide to cold email deliverability, and if you are still shortlisting vendors, we keep a running rundown of email deliverability tools compared.

The verdict

Buy GlockApps if deliverability forensics is part of your job. It is the better instrument: DMARC analytics, multi-provider seed testing, blacklist and uptime monitoring in one place, plus a free tier that lets you diagnose an incident before you commit. If you only need it occasionally, the free tier plus an Essential month when something breaks is a sane way to use it.

Buy MailReach if you are rebuilding mailbox reputation and your sending platform has no warm-up worth the name. The warm-up engine plus reputation dashboard is focused and well-executed, and at a handful of mailboxes $19.50 each is easy to justify. Check the math before you scale: 20 mailboxes is $390 a month, 50 is $975, and that is on top of whatever you pay to actually send.

Buy neither if you are a cold email team whose real need is warm-up, rotation and sending in one flat-priced tool. Pair the free first-party dashboards (Postmaster Tools and SNDS) with a platform that already includes automatic email warm-up and inbox rotation, and you have covered the two rows of that table that actually apply to you, at one price, with one login. That is ColdMailer: bring your own SMTP, unlimited mailboxes, warm-up and rotation included, $49 a month flat on Pro, free to try on 100 emails a month.

What we will not claim is that we replace GlockApps. We do not. If you need to read DMARC aggregate reports and prove where a message landed across a dozen providers, buy the instrument built for that. Just be clear-eyed about which of these three jobs you are buying, and do not pay for all three by accident.