7 Best Mailscale Alternatives in 2026

InfraForge is a strong match if you want dedicated-IP email infrastructure built for high-volume cold outreach. It is part of the Salesforge "Forge Stack," so it pairs naturally with Mailforge (cheap mailboxes), Primeforge (Google/Microsoft accounts), and the Salesforge sequencer.

Pricing is $3 per mailbox per month plus $99 per dedicated IP per month. That per-IP line item is the catch and the point: you are explicitly paying for dedicated IPs and IP-level isolation, billed separately. It scales cleanly to high volume.

The trade-off versus Mailscale is that the dedicated IP does not automatically bundle real Google Workspace mailboxes (those live in the separate Primeforge product), so a full setup can mean stitching two products together, and the $99/IP fee makes it expensive at small scale.

AeroSend takes the isolation idea further and adds the monitoring layer Mailscale largely leaves to you. Every block of 10 domains runs on its own dedicated servers and IPs (a "pod"), and the platform watches each domain across five metrics, then fires a domain burn alert before deliverability collapses so you can throttle or swap a domain.

Pricing is slot-based: $120/mo per 10-domain slot on Starter (30 mailboxes, about $4/mailbox), $112 on Growth, and $105 on Scale, dropping toward roughly $93 per slot at higher volume (about $3.10/mailbox). Aged IPs, dynamic IP rotation, premium warmup, and bi-weekly placement tests are included.

It is a young company with thin third-party validation (around five G2 reviews), no free trial, a hard 10-domain (about 30-mailbox) minimum, and it is private SMTP, not Google/Microsoft. But if you want dedicated isolation with active monitoring built in, AeroSend is arguably the more complete version of that idea.

If Mailscale appealed to you on a per-mailbox cost basis, Maildoso usually wins the price war outright. It is SMTP-first infrastructure built for outbound, with a floor as low as $0.80 per mailbox at 20,000 scale and a hero rate around $1.80. Combo plans bundle SMTP with official Google Workspace accounts.

It runs inbox placement tests every three days with per-mailbox health scores, plus self-healing mailboxes that pause and rotate burned accounts. Maildoso manages 400k+ mailboxes with a 4.7 G2 rating across 179 reviews and offers one-click export to Instantly, Smartlead, Apollo, and more.

The trade-offs: no Microsoft 365 support (SMTP and Google only), Google Workspace only available inside Combo bundles, no managed warmup product (it gives a recommended cadence instead), and tiered pricing asks you to commit to a target volume upfront. Both are SMTP-first, but Maildoso is dramatically cheaper per mailbox.

Zapmail solves the "I do not want to wait on warmup" problem with pre-warmed Google Workspace and Microsoft 365 mailboxes (12 weeks of warmup done before delivery). Setup is OAuth-based and lands in about 10 minutes, and the plan structure mirrors InboxKit: Starter $39/mo (10 mailboxes), Growth $99/mo (30), Pro $299/mo (100), with a $3.00/mailbox add-on floor advertised.

It also ships ZapShield (reputation protection and blacklist monitoring), built-in placement testing with per-plan credits (3/10/30 per month), and 50+ outreach integrations.

The limitations: no Azure option, pre-warmed pricing is not exposed publicly until signup, placement-test credits are hard-capped per plan rather than unlimited, and API access is locked to the $299 Pro tier. Compare it to InboxKit, which offers pre-warmed accounts without a premium surcharge, API on all plans, and Azure mailboxes Zapmail does not have.

PrimeForge is the Salesforge ecosystem's answer for buyers who want real Google and Microsoft mailboxes rather than SMTP. Pricing is $4.50/mailbox monthly or $3.50 annually, with a 10-slot minimum. Mailboxes come pre-warmed with automated DNS, US IPs, and ESP matching for deliverability.

It is a solid, mainstream way to get Google/Microsoft inboxes if you are already buying into the Forge stack, and it pairs with Mailforge, InfraForge, and the Salesforge sequencer.

The trade-offs versus InboxKit are a higher per-mailbox price ($3.50 to $4.50 vs $2.50 to $3.50 effective), a complex multi-product ecosystem to navigate, and no standalone monitoring suite. If price and bundled monitoring matter, weigh it against InboxKit directly.

ScaledMail is the white-glove option: you tell them your volume target and which providers you want, and the team registers domains, configures DNS, provisions mailboxes, runs warmup, and monitors deliverability. The defining feature is the multi-provider mix, you can blend Google Workspace ($3.50/mailbox), Microsoft Outlook ($50/domain for 25 mailboxes, about $2 each), and SMTP ($3.75/domain for 4 mailboxes, under $1 each) in one package. A 2,000-emails-per-day blended setup runs roughly $398/month base.

It is fully managed in 24 to 72 hours with isolated tenants and 2,000+ agency customers.

The trade-offs: no self-serve dashboard (you go through the team), reporting is a paid add-on that can add 50 to 65%, no free trial, and lower send caps on Outlook/SMTP (10/day) than Google (25/day). If you would rather offload the entire build than manage mailboxes yourself, ScaledMail is the managed alternative.