Who looks for a Mail-Tester alternative
Mail-Tester scores one message against a spam filter and a set of DNS checks. What it cannot tell you is where the message lands at Google, Microsoft and Yahoo, which is the question behind most Mail-Tester alternative searches. The tools below either test placement per provider or, in MailStrike's case, include the test with the warming that changes the result.
What Mail-Tester documents about itself: A single-address spam-score test with a set of free DNS tools. none: a spam-score test, no warmup.
The 5 alternatives, side by side
| Tool | Warming method (their words) | Spam rescue | Placement test | Seed lists | At 10 mailboxes |
|---|---|---|---|---|---|
| MailStrikeOur product | AI-powered peer-to-peer email engagement, with spam rescue: an AI persona on every mailbox, every thread written fresh from your company description | Yes | Yes, included on every plan | Yes, sold standalone, with proof of engagement on request | $92/mo |
| GlockApps | None: GlockApps sells no warmup | — | Yes (115 seed addresses, 5 spam filters, on credits) | No | —No warmup product; placement testing is priced by test credits, from $59 a month on Essential |
| MailReach | Peer-to-peer AI-written email engagement and spam rescue, one behavior per mailbox | Yes | Yes, on credits | No | $195/mo |
| Folderly | Not documented on its site beyond “daily monitoring, AI insights, and automated email protection” | — | Yes (Inbox Insights) | — | —$96 per mailbox a month billed yearly for 1 to 9 mailboxes and $56 for 25 to 99 as the overview page states; the 10 to 24 and 100-plus bands are not shown |
| Warmy | Peer-to-peer industry-templated email engagement and spam rescue | Yes | Yes | Yes, requires an active Warmy subscription | —Not published; volume-based pricing quoted after a demo |
“No” means the vendor's own public material documents no such feature; “—” means it is not documented either way. Prices are the vendor's published figure for the plan that covers 10 mailboxes, read ; the basis for each is under the tool below.
What the columns cannot show: detectability
Warmup only works while the receiver reads it as ordinary mail. Engagement that repeats, the same phrases moving between the same pool of mailboxes on a schedule, is a pattern Google and Microsoft can recognize, and neither approves of warmup it can detect. A tool whose own material describes templates, a fixed reply rate or a shared pool is describing the pattern the filters have to work with.
MailStrike is built the other way round. Every thread is written by the LLM in the mailbox owner's own style, with the context of the thread it belongs to, so there is no template to match and nothing to repeat. That is what makes the engagement effectively undetectable to inbox filters, and it is the difference no feature column on this page can show you. How the warming works.
Monthly cost at 10 mailboxes, USD, on the plan each vendor publishes for that count
Each tool, in its own words
MailStrike
A dedicated email warmup platform with placement tests and Seed Lists; it never sends your campaigns. AI-powered peer-to-peer email engagement, with spam rescue: an AI persona on every mailbox, every thread written fresh from your company description. Spam rescue: yes. Placement test: yes, included on every plan. No free trial; the Free Deliverability Test is free, signup required, no card.
Price: Solo $18 a month for one mailbox, Growth $45 for up to 6, Professional $92 for up to 20, billed annually; monthly billing and the Custom plan on the pricing page. At 10 mailboxes: $92 a month (Professional plan, up to 20 mailboxes, billed annually). Best for: Warming that reads as a team of different people and is effectively undetectable to inbox filters; B2C senders who need seed protection. How the warming works.
GlockApps
Placement testing, DMARC analytics, IP reputation and uptime monitoring; no warmup product. None: GlockApps sells no warmup. Spam rescue: not documented. Placement test: yes (115 seed addresses, 5 spam filters, on credits). Free plan with 2 test credits.
Price: No warmup product. Spam testing: Free (2 test credits), Essential $59 a month (360 credits; $708 a year), Growth $99 (1,080), Enterprise $129 (1,800). No published figure for 10 mailboxes: No warmup product; placement testing is priced by test credits, from $59 a month on Essential. Best for: Deep placement testing and DMARC reporting alongside a separate warmup tool.
MailReach
A warmer and a spam tester sold as one All-In-One plan; the spam tester also sold alone on credits. Peer-to-peer AI-written email engagement and spam rescue, one behavior per mailbox. Spam rescue: yes. Placement test: yes, on credits. Languages: English.
Price: $19.50 per mailbox a month billed monthly (20% off billed annually); spam tester alone on credits (200 credits $210); 100 or more mailboxes quoted. At 10 mailboxes: $195 a month ($19.50 per mailbox a month, billed monthly; 100 or more mailboxes are quoted). Best for: Self-serve warming with a spam tester in the same account, priced per mailbox. MailReach vs MailStrike.
Folderly
A deliverability platform: mailbox warmup, Inbox Insights placement tests and Pulse monitoring, with consulting. Not documented on its site beyond “daily monitoring, AI insights, and automated email protection”. Spam rescue: not documented. Placement test: yes (Inbox Insights).
Price: Mailbox Warmup $96 per mailbox a month billed yearly for 1 to 9 mailboxes, $56 for 25 to 99; Inbox Insights free (2 tests a month) or $79 a month (100 tests); Pulse free tier. No published figure for 10 mailboxes: $96 per mailbox a month billed yearly for 1 to 9 mailboxes and $56 for 25 to 99 as the overview page states; the 10 to 24 and 100-plus bands are not shown. Best for: Teams that want monitoring, placement tests and a consulting relationship around warmup, at a per-mailbox price.
Warmy
An all-in-one deliverability platform: warmup, seed lists, insights, Google Postmaster integration, email verification. Peer-to-peer industry-templated email engagement and spam rescue. Spam rescue: yes. Placement test: yes. Languages: More than 30 languages. 7-day trial, no card.
Price: Not published: three volume-based plans (B2B sender, B2C sender, Custom), quoted after a demo; 7-day trial without a card. No published figure for 10 mailboxes: Not published; volume-based pricing quoted after a demo. Best for: Warming in one of more than 30 languages, with pricing quoted after a demo. Warmy vs MailStrike.
Switching without a gap
- Run the two side by side for a few days, then turn the old one off on the mailboxes the new one warms, so they do not overlap.
- Run a placement test before you switch and again after the ramp, so the change is measured rather than felt.
- Expect a 21-day ramp on a new warmer: the volume climbs day by day, and outreach starts at 20 to 30 a day per mailbox once placement holds.
- Check the domain first with the reputation checker: a blacklist listing or a missing DMARC record is not something any warmer fixes.
Questions about Mail-Tester alternatives
Is MailStrike a good Mail-Tester alternative?
Mail-Tester scores one message against a spam filter and a set of DNS checks. What it cannot tell you is where the message lands at Google, Microsoft and Yahoo, which is the question behind most Mail-Tester alternative searches. The tools below either test placement per provider or, in MailStrike's case, include the test with the warming that changes the result.
Is there a free Mail-Tester alternative?
GlockApps publishes a free plan: free plan with 2 test credits. MailStrike has no free plan; its Free Deliverability Test is free with a signup and no card, and it shows where your mail lands before you pay for anything.
Which Mail-Tester alternative costs the least per mailbox?
On the vendors' own published prices for 10 mailboxes (read 2026-09-06), MailStrike is the lowest on this list at $92 a month (Professional plan, up to 20 mailboxes, billed annually). MailReach $195. Tools with no figure here either price by another unit or quote after a demo; the table on this page says which.
What should I check before choosing a Mail-Tester alternative?
Four things, in this order: what actually engages with your mail (templated content is what Google and Microsoft detect), whether the tool rescues warming mail from spam, whether a placement test is included or sold separately, and what the price is at your mailbox count rather than for one inbox. Every column in the table above is one of those.