MailReach vs Instantly: A Second Warmer or the Sender's Own

The short answer: if every mailbox you send from is already connected to Instantly, warm-up is part of its $47 Growth plan and placement testing is a $47 add-on with unlimited one-time tests, so MailReach's $25 a mailbox a month buys a second warmer plus 20 spam tests; MailReach earns its place for mailboxes that send from somewhere else, or when you want the test run by a company that does not also send your campaigns (Instantly plans overview, MailReach pricing, monthly billing, checked on 26 October 2026). Choose Instantly if your job is sending cold email at volume with warm-up and testing under one login. Choose MailReach if your job is warming and testing mailboxes your sequencer does not warm.

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Before you pay for a second warmer:

1. The add-on against the per-mailbox rate. For example, five mailboxes in MailReach cost 5 x $25 = $125 a month, while Instantly's Inbox Placement add-on costs $47 a month whatever the number of accounts tested, per the plans overview and the MailReach pricing page. If the mailboxes are in Instantly already, the test is the only thing you would be buying twice.
2. Where each mailbox sends from today. Instantly warms accounts connected to an active Outbound plan; its warm-up article says the pre-warmed and done-for-you account subscriptions cover the accounts, not the warm-up. MailReach connects any provider that supports SMTP, from Google Workspace to Amazon SES, per its pricing FAQ.
3. The number Gmail itself reports. Set up Google Postmaster Tools for the sending domain before changing anything. Google's sender guidelines ask senders to keep the spam rate shown there below 0.10% and never reach 0.30%; that is the line either tool is in service of.

What each score is made of

Sources: Instantly's warm-up article, readiness article, Inbox Placement article and outside-Instantly test; MailReach's homepage, getting started article and spam test documentation.

Two warmers, documented two ways

Instantly describes its warm-up as an exchange inside its own user base: your account sends to other accounts in the pool and receives from them, every warm-up email is opened automatically and a high share get positive replies, per its warm-up article. Its readiness article recommends adding one warm-up email a day up to 10, with a 30% reply rate, and warm-up emails do not count toward the 30 campaign emails a day it suggests per account (limits article).

MailReach describes conversations with a network of high-reputation accounts. On its default Autopilot mode the mailbox ramps to around 40 to 50 warming emails a day, almost all hidden from your inbox, per the getting started article. The same article is blunt about its own number: the Reputation Score is not an indicator that a mailbox is ready, and reputation is not the only thing that decides where mail lands. Content and sending setup decide the rest, which is why the spam test exists.

What Gmail and Yahoo say they measure

Neither mailbox provider's sender page mentions warm-up. Google's guidelines require SPF or DKIM from every sender and SPF, DKIM and DMARC from anyone sending 5,000 or more messages a day to personal Gmail accounts, ask for volume to start low, go to engaged recipients first and rise slowly, and measure the spam rate your recipients report. Yahoo's sender requirements set the spam rate below 0.3% and ask for authentication on the same lines. Both warm-up scores read mail exchanged between warming accounts; the providers read your recipients. Keep both numbers on the same sheet.

The bill at three mailbox counts

Monthly billing in USD, checked on 26 October 2026 on the MailReach pricing page, the Instantly pricing file and the plans overview. MailReach's rate falls from $25 a mailbox for 1 to 5, to $19.5 for 6 to 20, $18 for 21 to 50 and $16 above, with 20% off on annual billing. Instantly's Outbound plan is priced by emails and uploaded contacts, not mailboxes: Growth stops at 5,000 emails and 1,000 contacts, Hypergrowth is $97, and the $97 placement plan adds automated tests.

One agent step, then a person reads the test

Instantly's readiness article documents a question you can put to Instantly AI in the app: whether an account is warmed up and ready for campaigns. Copilot checks the warm-up start date and the health score and says when the account will be ready (readiness article). Let it answer that, then keep the decision to launch with a person, who first sends one real campaign email through a placement test and reads the result by provider. The agent knows the warm-up history; only the test shows your actual email.

Free before either bill

Run the free tests first. MailReach's homepage offers a free spam test, and Instantly's Inbox Placement article allows two one-time tests at no charge and has a mode for mail sent from outside Instantly. Two tests of the same real email, plus a week of Postmaster data, tell you whether you have a reputation problem or a content one before you add a subscription.

Notice what holds Instantly's warm-up in place. The readiness article says warm-up pauses when a workspace expires and that pre-warmed account subscriptions cover the accounts only, so a pre-warmed mailbox bought at $10 a month (plans overview) stays warm only while the $47 Outbound plan is also paid.

Choose MailReach if

• Some mailboxes send from a tool that does not warm them, through any SMTP provider.
• You want spam tests scored separately for professional and personal inboxes.
• You prefer the warmer and the tester to come from a vendor that does not send your campaigns.

Choose Instantly if

• Your campaigns already go out through Instantly, where warm-up costs nothing extra.
• Unlimited placement tests for $47 a month beat buying credits mailbox by mailbox.
• Automated tests that can pause a campaign when placement drops matter, on the $97 placement plan.

The entries: MailReach and Instantly, and how to use MailReach for working through a spam problem test by test.

FAQ

Does Instantly include placement tests in the Growth plan?

No. Placement testing is a separate add-on, $47 a month for unlimited one-time tests or $97 with automated tests, per the plans overview; two one-time tests are free.

How long before a new mailbox sends campaigns?

At least two weeks with a health score above 90% on Instantly, three for its AirMail accounts (readiness article); at least 14 days with no campaigns on MailReach (pricing FAQ).

Do warm-up emails count toward Instantly's sending limits?

No. Its limits article keeps warm-up outside both the account limit and the campaign limit.