5 Best Inboxkit Alternatives & Competitors for Google/Outlook Mailboxes
If you’re looking for Inboxkit alternatives, you’re probably trying to set up Google Workspace or Microsoft 365 mailboxes for cold email without dealing with DNS, warm-up, or deliverability issues.
Inboxkit is popular because it offers official Google and Microsoft inboxes, automated setup, and high inbox placement in just a few minutes.
But it’s not the only tool that can do this.
In this guide, we’ll cover the 5 best Inboxkit alternatives and show which tools work best for Google and Outlook mailboxes, depending on how you send cold emails and scale outbound.
So, let’s begin!
TL;DR – 5 Best Inboxkit Alternatives for Google/Outlook Mailboxes
- Primeforge – Best overall alternative for scalable Google Workspace & Microsoft 365 mailboxes with automated setup
- Smartlead – Best if you want outreach + deliverability in one tool using Google/Outlook inboxes
- Zapmail – Ideal for fast, pre-warmed Google & Microsoft mailboxes with minimal setup
- Lemlist – Best for personalized cold email campaigns using Google and Outlook inboxes
- Instantly – Best for high-volume cold email with built-in warm-up and inbox rotation
How We Evaluated These InboxKit Alternatives
To find the best and most reliable Inboxkit alternatives, we focused on factors that directly affect mailbox quality, deliverability, and inbox management efficiency for Google Workspace and Microsoft 365.
- Mailbox quality & reliability, including how stable the inboxes are and how long they remain active without issues.
- Deliverability performance, including inbox placement, spam risk, and sender reputation management.
- Google & Microsoft support, including proper setup for Google Workspace and Microsoft 365 mailboxes.
- Scalability, including how well each tool handles multiple inboxes and domains as volume grows.
- Automation & bulk setup, including DNS automation, API access, and bulk mailbox creation.
- Pricing & scalability, evaluating how well each tool supports solo users, teams, and large-scale agencies.
Each alternative was reviewed based on how well it improves inbox reliability, deliverability, and scaling compared to Inboxkit.
1. Primeforge – Scalable Google & Outlook Mailboxes for Cold Email
Primeforge is a cold email infrastructure platform that helps you create and manage Google Workspace and Microsoft 365 mailboxes optimized for outbound email.
The platform automates domain setup, DNS configuration, and mailbox provisioning so you can focus on sending instead of manual email infrastructure work.
Primeforge is built for teams of all sizes, from solo operators to agencies, and is designed to improve inbox placement and deliverability for cold outreach.
Key Features of Primeforge
- Primeforge provides real Google and Outlook inboxes, which match the mail providers most prospects use and help improve inbox placement.
- The platform automatically configures SPF, DKIM, and DMARC records, reducing technical setup time and preventing common DNS errors.
- Mailboxes are created with US IPs, which can improve sender reputation and deliverability in the U.S. market.
- Primeforge can create and configure domains and mailboxes in around 30 minutes, much faster than manual setups.
- The platform lets you set static images or animated GIF profile pictures at scale to help your inboxes stand out.
- Mailboxes can be connected to most sending and outreach platforms without complex integrations.
Primeforge vs InboxKit: Quick Comparison
Pros of Primeforge
- Primeforge automates the entire setup of mailboxes and DNS records, saving technical time.
- It includes US IP addresses to improve deliverability.
- It offers bulk mailbox creation and management for scaling teams.
- Supports API access for developers and automation.
Cons of Primeforge
- Setup time is slightly longer than Inboxkit (~30 minutes vs ~10 minutes).
- Does not include built-in sending and sequencing tools, you need to connect to an external outreach platform.
Primeforge Pricing
- Mailbox pricing ranges from approximately $3.5 to $4.5 per mailbox per month, depending on the billing plan you choose.
- Domains are typically charged separately (standard domain registration fees apply).
- Pricing is per mailbox slot, and you can create or reassign mailboxes within your purchased slots.
- Annual billing usually includes a discount compared to monthly billing.
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2. Smartlead – Cold Email Sending & Automation Platform
Smartlead is a cold email outreach and automation platform designed to help sales teams, marketers, and agencies send personalized cold emails at scale.
It does not provide mailbox infrastructure. Instead, it focuses on email sending, sequencing, inbox rotation, warm-up, and analytics once mailboxes are already set up.
Smartlead is commonly used alongside infrastructure providers like InboxKit, Primeforge, or Google Workspace to manage outreach campaigns efficiently.
Key Features of Smartlead
- Smartlead allows users to connect unlimited Google Workspace and Microsoft 365 inboxes without paying per email account.
- The platform includes unlimited email warm-up, helping new inboxes gradually build sender reputation before cold outreach.
- Smartlead supports dynamic inbox rotation, distributing sending volume across multiple inboxes to reduce spam risk.
- Users can create dynamic sequences with conditional steps for replies, opens, and follow-ups.
- A centralized master inbox lets teams manage replies from all connected mailboxes in one place.
Smartlead vs InboxKit: Quick Comparison
Pros of Smartlead
- Smartlead does not charge per inbox, allowing unlimited email accounts on all plans.
- It includes unlimited warm-up, reducing the need for third-party warm-up tools.
- Strong automation features for inbox rotation and dynamic sequences.
Cons of Smartlead
- Smartlead does not provide Google Workspace or Microsoft 365 mailboxes.
- DNS setup and domain configuration must be handled externally.
Smartlead Pricing
- Basic Plan – $39/month, includes 2,000 active leads, 6,000 emails per month, unlimited email accounts, unlimited warm-up, dynamic IPs, analytics, and API access.
- Pro Plan – $94/month, supports 30,000 active leads and 150,000 emails per month, with unlimited inboxes, warm-up, integrations, webhooks, ChatGPT-4 assistance, and unlimited seats.
- Custom Plan – $174/month and up, offering up to 12M active lead credits and up to 60M email credits per month, with all Pro features included.
- Add-on – Client management available at $29 per client per month.
- Free Trial – Available on all plans.
3. Zapmail – Pre-Warmed Google & Outlook Mailboxes for Cold Email
Zapmail is a cold email infrastructure platform that helps you create and manage Google Workspace and Microsoft 365 mailboxes built specifically for cold outreach.
It focuses on fast setup, strong deliverability, and scale, making it easy to launch campaigns without dealing with manual DNS or long warm-up periods.
Key Features of Zapmail
- Zapmail provides official Google Workspace and Microsoft 365 mailboxes hosted on US or EU IP addresses to support better inbox placement.
- The platform offers pre-warmed mailboxes, allowing users to start sending from day one instead of waiting weeks for warm-up.
- Zapmail automatically configures SPF, DKIM, DMARC, and custom tracking domains during setup, removing manual DNS work.
- Each domain runs in its own workspace with admin access, which helps isolate reputation and reduce cross-domain risk.
- Zapmail supports bulk domain and mailbox creation, making it easy to scale from a few inboxes to hundreds.
Zapmail vs InboxKit: Quick Comparison
Pros of Zapmail
- Pre-warmed mailbox options reduce warm-up time and risk.
- Strong workspace-level isolation improves deliverability.
- Wide compatibility with most cold email sending platforms.
- Supports bulk operations for agencies and scaling teams.
Cons of Zapmail
- Pricing can increase as mailbox count grows.
- Primarily focused on outbound use cases, not general email hosting.
- No refund policy once a plan is purchased.
Zapmail Pricing
- Starter Plan – $39/month, includes 10 Google or Microsoft mailboxes, with additional mailboxes at $3.50 per mailbox.
- Growth Plan – $99/month, includes 30 mailboxes, with additional mailboxes at $3.25 per mailbox.
- Pro Plan – $299/month, includes 100 mailboxes, with additional mailboxes at $3.00 per mailbox and API access.
- Pre-warmed mailbox plans are available separately, with higher per-mailbox pricing based on warm-up history.
- Discounts are available on quarterly and yearly billing plans.
4. Lemlist – Multichannel Outreach & Sales Engagement Platform
Lemlist is a sales engagement and prospecting platform built to help teams find leads and reach them through email, LinkedIn, WhatsApp, and calls.
Lemlist does not provide mailbox infrastructure. Instead, it focuses on finding leads, personalizing messages, running multichannel sequences, and managing replies.
Key Features of Lemlist
- It offers built-in email and phone enrichment, pulling verified contact data using waterfall enrichment.
- Lemlist supports multichannel sequences, including email, LinkedIn actions, WhatsApp messages, and calls from a single workflow.
- The platform provides AI-powered personalization, using dynamic variables, custom images, videos, and landing pages.
- A centralized inbox lets teams manage replies from all channels in one place.
- Lemlist includes lemwarm, a built-in email warm-up and deliverability tool available with every plan.
Lemlist vs InboxKit: Quick Comparison
Pros of Lemlist
- All-in-one platform for lead finding, outreach, and follow-ups.
- Strong multichannel support beyond email alone.
- Built-in warm-up tool included with all plans.
Cons of Lemlist
- Does not provide Google Workspace or Microsoft 365 mailboxes.
- Email deliverability depends on the quality of connected inboxes.
- Higher cost compared to email-only sending tools.
Lemlist Pricing
- Email Pro – from $69/user/month, includes email outreach, AI personalization, lemwarm, inbox rotation, and lead database access.
- Multichannel Expert – from $99/user/month, adds LinkedIn automation, WhatsApp (paid add-on), calling, centralized multichannel inbox, and advanced targeting.
- Enterprise – Custom pricing, includes advanced API access, assigned account manager, and enterprise security features.
5. Instantly – Cold Email Outreach, Lead Intelligence & Deliverability Platform
Instantly is a sales engagement and cold email outreach platform designed to help businesses find leads, send emails at scale, and improve inbox placement using automation and AI.
It focuses on email sending, warm-up, inbox rotation, lead finding, and campaign optimization, rather than selling standalone mailbox infrastructure.
Key Features of Instantly
- Instantly allows users to connect unlimited email accounts from Google Workspace, Microsoft 365, or SMTP providers without charging per inbox.
- The platform includes unlimited email warm-up, using a large peer-to-peer warm-up pool to improve sender reputation and inbox placement.
- Instantly supports inbox rotation, automatically distributing emails across multiple sending accounts to reduce spam risk.
- A built-in B2B lead database (SuperSearch) helps users find and enrich verified leads using filters, waterfall enrichment, and AI.
- AI-powered features include sequence generation, reply assistance, spam word checking, and lead filtering.
Instantly vs InboxKit: Quick Comparison
Pros of Instantly
- Unlimited email accounts on all plans without per-inbox fees.
- Built-in warm-up and deliverability tools included by default.
- Strong automation for inbox rotation and campaign scaling.
Cons of Instantly
- It does not provide native Google Workspace or Microsoft 365 mailboxes.
- Domain setup and DNS configuration must be handled separately unless using add-on services.
- Inbox infrastructure quality depends on external providers.
Instantly Pricing
- Growth – $37/month, includes unlimited email accounts, unlimited warm-up, 1,000 uploaded contacts, and 5,000 emails per month.
- Hypergrowth – $97/month, supports 25,000 uploaded contacts, 100,000 emails per month, unlimited inboxes, warm-up, and priority support.
- Light Speed – $358/month, includes everything in Hypergrowth plus 500,000 emails per month and advanced deliverability features.
- Free Trial – Available on all plans with no credit card required.
Which InboxKit Alternative Should You Choose?
Choosing the right InboxKit alternative depends on what matters most to you: speed, control, scale, cost, or long-term deliverability.
Here’s a quick guide to help you choose the best InboxKit alternative:
- If you want the most balanced option for Google Workspace and Microsoft 365 mailboxes, with clean setup and room to scale → Go with Primeforge
- If you want a sending and automation platform and already have inboxes → Use Smartlead
- If you want pre-warmed inboxes you can start using immediately → Choose Zapmail
- If you want an all-in-one cold email tool with built-in sending → Try Instantly
- If you want multichannel outreach beyond email (LinkedIn, calls, WhatsApp) → Use Lemlist
If you’re looking for a clean, scalable, and future-proof InboxKit alternative for Google and Microsoft mailboxes, Primeforge is the best long-term choice.
Try Primeforge to build Google & Microsoft mailboxes that scale smoothly with your outbound strategy.