GMass vs Mailreach: Cross-Category Comparison

MailReach pricing is set per mailbox. Its calculator, which displayed euros for this comparison, charges €25 a mailbox a month for one to five mailboxes on monthly billing, €19.5 a mailbox at ten and €18 at fifty, and about 20% less on annual billing, with at least 20 spam test credits included. GMass sits at the other end of the same run: a sender that works inside Gmail, priced by plan, which served its prices in pounds here, from £23 a month. One sells the warming and the evidence that it worked; the other puts the campaign into those mailboxes.

MailReach pricing

MailReach sells one All-In-One plan, email warming plus spam testing, priced per mailbox through a calculator rather than a plan ladder. Displayed in euros, it read €25 a mailbox a month at one to five mailboxes, €19.5 at ten and twenty, €18 at fifty and €16 at one hundred, on monthly billing. Annual billing is marked "Save 20%", and 100+ mailboxes moves to custom pricing.

Every count includes warm-up of up to 100 emails a day per mailbox, 20 spam test credits, domain and inbox health checks and a reputation tracking dashboard. The page's raw HTML carries dollar placeholders, so visitors elsewhere may be quoted in dollars; the euro figures are what its calculator displayed here. A fuller breakdown is in MailReach pricing explained.

Source: Mailreach Pricing

Why These Two Get Compared

GMass and MailReach both appear in a cold outbound budget, and they buy different things. A sending platform runs the campaign: the list, the sequencing, the sending schedule and the replies. A warm-up tool works on the mailbox underneath it, generating the engagement history that decides whether the campaign reaches an inbox or a spam folder. Neither substitutes for the other.

The comparison also exposes a pricing difference that matters more than the feature lists. GMass publishes a plan ladder you can read in ten seconds. MailReach publishes a calculator, so the figure that applies to you depends on the mailbox count you enter.

Teams working through a wider stack decision often hit the same cross-category question elsewhere; the Apollo and Lead411 comparison covers it on a different pair of categories.

Where Each Tool Fits In A Cold Outbound Run

A cold outbound run at RevenueFlow is built on one message per campaign, no thread replies and no bump sequences, spread across a fleet of mailboxes each sending a modest daily volume. That shape is what makes the warming question sharp: a fleet of low-volume mailboxes only works if every mailbox in it is trusted, and a mailbox with no history is not.

Mailreach warms and then tests. Its page says the email warmer plan "always includes at least 20 spam tests credits", which is a different proposition from warming alone: the tests are what tell you whether the warming is working before a campaign proves it the expensive way.

Pricing Comparison

GMass Pricing

GMass's pricing page adjusts prices by country and states: "Pricing has been adjusted for United Kingdom. Prices below are in GBP." These are the figures it served here, so they are quoted in pounds; a visitor elsewhere is shown their own currency.

Every plan lists unlimited emails, contacts and campaigns, with a footnote that breaking Gmail's limits "depends on individual account configuration". Premium adds API access with Zapier, A/B testing, triggered emails and inbox rotation, which GMass calls MultiSend; Professional adds high-priority support.

Source: GMass Pricing

How Each Side Actually Prices

GMass runs inside Gmail and sells feature tiers rather than volume: the difference between Standard and Premium is API access, A/B testing, triggered emails and rotation, not a send allowance. Its annual column is wide, Standard at £15 a month against £23 billed monthly, so an annual commitment changes this comparison a great deal.

MailReach sells volume and nothing else: every mailbox gets the same warming and the same spam test credits, and the rate per mailbox falls in steps as the count rises.

What A Two-Tool Stack Costs

For an illustrative ten-mailbox setup, invented for the arithmetic rather than taken from a client, the two sides behave very differently. MailReach's calculator gives €195 a month for ten mailboxes on monthly billing, or €156 on annual billing. GMass needs Premium if the ten mailboxes are to be rotated, at £31 a month or £22 on annual billing for one user.

The two bills arrive in different currencies as served here, so this page does not add them. The shape is the useful part: the warming line grows with every mailbox added, while the GMass line moves only with users and features.

Does GMass Include Warm-up?

No longer. GMass's own warm-up page now reads: "The warm-up service has officially ended and can't be used anymore." Its pricing page lists no warm-up on any plan. What it does sell on the deliverability side is Spam Solver on every plan and inbox rotation, MultiSend, from Premium, which is a different job: rotation spreads a day across mailboxes, and warming is what makes each of those mailboxes worth sending from.

GMass also publishes a free placement tester. Its inbox page invites you to "Send your campaign to our test accounts and watch where it lands in real time", across 15 test addresses, some behind filters including Barracuda, Mimecast and Sophos. So both vendors list placement testing: GMass as a free standalone tool, MailReach as spam test credits bundled with its warming.

How To Tell The Warming Worked

Reply rate is the honest measure and it is the slowest one to arrive. Bounce composition moves sooner and says more: a rising share of soft bounces and policy rejections concentrated on one mailbox provider points at reputation, while a rising share of unknown-user bounces points at the list instead. Those are different problems and only the first one is what a warm-up tool is for.

Placement tests are the strongest evidence available here, because they report where a message actually landed rather than how hard the warming worked. A vendor dashboard reports its own activity, so a score that improves while replies do not has told you the tool ran rather than that placement changed.

What Warming Will Not Fix

Warming raises the odds that a message is seen. It does nothing about whether the message deserved to be. A warmed mailbox sending a badly targeted list gets the same silence as a cold one, and the engagement ratio the warming was protecting falls anyway once real recipients start ignoring real emails at volume.

Three things sit upstream of both tools and neither vendor sells them. The list has to be right, because relevance is what produces the replies that hold a reputation up. The offer has to be worth answering. And the send pattern has to stay ordinary: one message per campaign, no thread replies, no bump sequences, and a day's volume spread across mailboxes rather than concentrated in one.

Feature Highlights

GMass Standard, £23 a month

• Works inside Gmail
• Unlimited emails, contacts and campaigns
• Free email address verification
• Spam Solver, sequences and follow-ups
• A free inbox, spam or promotions tester
• Warm-up service has ended

MailReach, €25 a mailbox

• Automated warm-up, up to 100 emails a day
• At least 20 spam test credits
• Blacklist, SPF, DKIM and DMARC checks
• A reputation tracking dashboard
• Sends no campaigns

GMass's feature pages describe a Gmail-native sender: mail merge from Google Sheets, automatic follow-ups, scheduling, bounce and unsubscribe management, email verification and a REST API with webhooks and Zapier. MailReach's pricing page lists the warming algorithm, its AI deliverability assistant, warm-up across Google, Outlook and other ESPs, health checks and the reputation dashboard. A feature that appears on one vendor's page and not the other's is a difference in what each chose to publish, never proof that only one tool can do it.

Integration Ecosystem

GMass works inside Gmail and Google Workspace, reads merge fields from Google Sheets, connects apps through its REST API, webhooks or Zapier, and can send through third-party SMTP.

MailReach's page names warm-up for Google, Outlook, SendGrid, Mailgun, Amazon SES and SMTP, and says it is compatible with any email service provider that supports SMTP.

The shared ground is the mailbox. Both attach to the same Gmail or Google Workspace account, which is what lets one warm an address while the other sends from it, with no integration work between them.

When To Choose GMass First

Start with GMass when your mailboxes are established and landing in the inbox and you have no way to run a campaign from Gmail. Start with MailReach when the mailboxes are new, or replies have fallen away on established ones, and the sending itself is not the gap. Teams comparing GMass with other senders can read GMass vs Instantly or GMass vs Smartlead.

Using Both Together

The useful sequence with MailReach is warm, test, then send. Warming builds the reputation, the spam tests tell you whether it has actually moved, and only then does a GMass campaign go out. Skipping that middle step is what turns warming into an act of faith, because the only remaining evidence arrives after a list has already been spent on it.

Keep both running afterwards. A campaign changes the engagement ratio in a mailbox, and a fresh spam test a fortnight in will tell you whether the change moved placement, which is a far better early warning than a bounce rate.

Rolling It Out Without Losing The Reputation

Authenticate every sending domain with SPF, DKIM and DMARC before warming starts, and enter your real mailbox count in MailReach's calculator rather than trusting a headline figure. Then hold to the two house rules most often broken by a new stack. One message per campaign means a prospect who does not reply is re-approached in a fresh campaign with a fresh angle rather than chased down the same thread, and it keeps each mailbox's send pattern closer to ordinary correspondence. Spreading a day's volume across mailboxes does the same thing for the fleet.

Decision Shortcut

If you cannot currently answer the question where do our emails land, buy the warming and testing first, or run GMass's free tester before paying anyone. If you already know placement is fine and you have no way to run a campaign, buy GMass, choose Premium if you need rotation, and take the annual term. If the budget covers one and the mailboxes are new, the diagnostic half is the one that saves the list.

Related Reading

• Best GMass Alternatives in 2026
• Best Mailreach Alternatives in 2026
• Mailreach vs Warmbox

If you would rather have this run for you, RevenueFlow books qualified meetings on a pay-per-meeting basis, against criteria agreed in writing before launch, and publishes client results.

Pricing and features are taken from the vendors' own pages. Verify current terms with the vendor before relying on them.