Warmup tools help by doing the reputation-building work for you. They send emails on your behalf, generate opens and replies, and pull messages out of spam folders. Over time, your sender reputation strengthens and inbox placement improves before your campaigns even launch.
This list covers seven email warmup tools designed for sales teams, agencies, and marketers sending at scale. Each tool is broken down by features and pricing so you can find the right fit fast. So, whether you need unlimited warmup across dozens of inboxes or advanced deliverability monitoring for enterprise campaigns, there's an option here for you.
1. Instantly
Instantly is an all-in-one cold email platform with built-in warmup designed for high-volume senders. With over 1 million real accounts in its deliverability network, Instantly email warmup offers one of the largest warmup pools on the market. And because warmup is included on every plan with unlimited email accounts, scaling outreach doesn't mean increasing costs.
Key Features:
- Slow Ramp Warmup: Sending volume increases gradually, starting at 2 emails on day one, then 4 on day two, and so on. This keeps your activity looking natural to spam filters.
- Read Emulation: Warmup emails get scrolled through like a real person would read them, which tells email providers your messages are worth engaging with.
- Customizable Settings: You can set your own open rates, reply rates, and spam protection levels. There's also a weekdays-only option for even more realistic patterns.
- Spam Recovery: If warmup emails land in spam, they get moved to the primary inbox and marked as important automatically.
- Deliverability Monitoring: See your sender reputation score broken down by provider, so you know exactly when your accounts are ready to send.
Pricing: Starts at $37/month with unlimited email accounts and warmup included.
2. MailReach
MailReach is a standalone warmup tool built specifically for B2B cold email. Its network of more than 30,000 inboxes focuses heavily on Google Workspace and Office 365 accounts, which is a big plus if most of your prospects use Gmail or Outlook. The platform also tracks your sender reputation in real time, so you always know where you stand with major email providers.
Key Features:
Pricing: Starts at $25/month per mailbox.
3. Warmup Inbox
If you want a warmup tool that runs quietly in the background without constant adjustments, Warmup Inbox is worth checking out. Like MailReach, it connects your account to a network of 30,000 real inboxes. The tool also offers language-specific warmup, which is useful if you're targeting prospects in non-English speaking markets.
Key Features:
Pricing: $19/month per inbox, or $15/month when billed annually.
4. Folderly
Folderly positions itself as a full email deliverability platform rather than just a warmup tool. If your emails are landing in spam and you're not sure why, Folderly's AI analyzes your setup to find the problem. It looks at everything from technical configuration to email content, then gives you specific recommendations to fix it.
Key Features:
Pricing: Starts around $96/month per mailbox, with discounts for yearly billing and multiple inboxes.
5. Warmy.io
If you like having control over how your warmup runs, Warmy.io gives you plenty of room to customize. The platform uses AI to generate personalized warmup emails and lets you choose topics that match your industry. So if you're in real estate or SaaS, your warmup content can reflect that rather than sounding generic.
Key Features:
Pricing: Warmy.io doesn't display pricing on their website. You'll need to book a demo to get a quote.
6. InboxAlly
InboxAlly takes a different approach to warmup by using seed emails that simulate real user behavior. You send emails to their seed addresses, and those emails get opened, scrolled through, replied to, and moved to the primary inbox. This trains email providers to recognize your messages as wanted, which helps with inbox placement over time.
Key Features:
Pricing: Starts at $149/month for the Starter plan, which includes 100 seed emails per day and one sender profile.
7. Mailwarm
Mailwarm connects your inbox to a network of 1,000+ accounts that interact with your emails automatically. These interactions include opens, replies, starring, and marking as important. You control the schedule and frequency from a clean dashboard, and Mailwarm takes care of the rest.
Key Features:
Pricing: Starts at $69/month for one account with up to 50 daily interactions.
8. ProntoHQ
ProntoHQ is an outbound prospecting and data enrichment platform designed to help sales teams build highly targeted outreach lists quickly. Instead of focusing purely on warmup or deliverability, ProntoHQ improves cold email performance by ensuring you contact the right people with verified data and accurate buying signals. By aggregating information from over 100 data providers and verifying emails before they’re used, it helps reduce bounces and protect your sender reputation.
Key Features:
Final Thoughts
A good warmup tool does more than keep your emails out of spam. It gives you the confidence to scale your outreach knowing your messages will actually land where they're supposed to. For high-volume senders who need unlimited warmup across multiple inboxes without increasing costs, Instantly is the clear winner on this list. The combination of a massive deliverability network, granular warmup controls, and flat-rate pricing makes it hard to beat.
Of course, warmup can only do so much on its own. Clean lists, quality content, and proper authentication are all important when it comes to inbox placement. Get those right alongside your warmup, and your campaigns will have a much better shot at reaching real inboxes.
