GTM Hub
What is Warmup Inbox?
Email warmup service using 30,000+ real inboxes to build sender reputation and improve cold email deliverability. Automatically sends and receives emails, monitors spam/category placement, and tracks sender reputation across Gmail, Outlook, and other ESPs.
Warmup Inbox news
Warmup Inbox publishes placement-recovery playbook from 71,581 deliverability degradation events
Analyzed 71,581 recorded inbox placement failures to create recovery guide for users experiencing deliverability drops.
Source: aVenture.vc ↗Study: Domain age explains under 1% of cold-email placement
Research from 17,247 real inboxes in Warmup Inbox network shows domain age is not a significant factor in inbox placement.
Source: aVenture.vc ↗Launches Email Campaign Tool for cold outreach
Added built-in outreach campaign feature (CSV upload, scheduling, send limits) so users can run cold email from same dashboard as warmup.
Source: Warmup Inbox Blog ↗Releases public API for scaled inbox management
New API allows teams to provision, monitor, and manage large batches of warmed inboxes programmatically; included on all paid plans.
Source: Warmup Inbox Blog ↗Introduces Corporate Invites for team onboarding
Secure shareable links allow team members to add inboxes without sharing credentials; single-use or multi-use, with email restrictions and expiration dates.
Source: Warmup Inbox Help Center ↗
Key features
30K+ Real Inboxes Network
Exchanges authentic emails with verified human accounts; includes spam rescue (moves flagged emails back to inbox)
Spam & Category Monitoring
Real-time tracking of inbox vs. spam placement across major ESPs with deliverability alerts
Provider-Specific Reputation Scores
Separate reputation metrics for Gmail, Outlook, and other ISPs rather than blended scores
Outreach Sequences (Built-in)
Cold email campaign tool integrated into product since 2025; upload CSV, set send schedule, includes free lead verification
Warmup Customization
Pro/Max plans: custom templates, target specific ESPs, choose warmup topics, language selection (12 languages), scheduled warmup
Developer API
Launched Nov 2025; manage inboxes at scale, start/pause warmup, monitor health—included on all paid plans
Technical Setup Check
Max plan: validates SPF, DKIM, DMARC configuration; free SPF/DMARC generator available to all
Warmup Inbox pricing
Three tiered plans starting at $15/inbox/month (annual); volume discounts from 6 inboxes; 51+ inboxes quoted per account. Free tier available: 15 warmup emails/week, unlimited inboxes, no card required.
| Plan | Price | What's included |
|---|---|---|
| Basic | $15/inbox/month (annual) or $19/month (monthly) | 75 warmup messages/day, up to 25% reply rate, spam & category monitoring, email reputation check, outreach sequences, dashboards, AI-generated content, developer API, customer support chat |
| Pro | $49/inbox/month (annual) or $59/month (monthly) | Everything from Basic, plus: 250 warmup messages/day, up to 45% reply rate, custom templates, language warmup (12 languages), custom warmup settings, ESP-specific warmup, scheduled warmup, priority support |
| Max | $79/inbox/month (annual) or $99/month (monthly) | Everything from Pro, plus: 1,000 warmup messages/day, up to 50% reply rate, premium support, technical setup check, unlimited developer API, early access to new features |
| Freemium | Free | Unlimited inboxes, 15 warmup emails/week, receive from network, basic reports, no credit card required |
Pros & cons
Pros
- + 7-day free trial, no credit card required
- + Most affordable entry point ($15/month) with spam rescue, monitoring, and sequences included
- + 30,000+ real inboxes using authentic engagement signals
- + Fast setup (under 10 minutes) with intuitive, non-technical dashboard
- + Responsive customer support (praised on reviews)
- + Outreach sequences and API included at all tiers
- + Multi-language warmup available (12 languages)
- + Built-in campaign tool (added Nov 2025) eliminates need for separate outreach platform
Cons
- − Aggressive warmup defaults have caused permanent account suspensions on Google Workspace/Outlook, especially for new domains
- − Basic plan (75/day) is low volume; requires Pro ($49) for meaningful velocity
- − Per-inbox pricing becomes expensive at scale (e.g., $150/month for 5 Basic inboxes)
- − Limited reporting depth—no inbox health score, proactive deliverability alerts, or advanced diagnostics
- − Outlook/Microsoft 365 results can be inconsistent; Gmail performs better
- − Technical verification (SPF/DKIM/DMARC) locked behind Max plan ($79+)
- − Warmup takes 3–6 weeks to reach full effect
- − No built-in email sending beyond outreach sequences
- − API is limited on Basic plan; unlimited only on Max
Who is Warmup Inbox best for?
- • SDRs and sales teams using cold email on established domains
- • Freelancers and small agencies managing 1–5 email accounts
- • Recruiters building sender reputation for outreach
- • Startups needing low-cost warmup + built-in campaigns in one platform
Frequently asked questions
Do I need a credit card for the free trial?
No. The 7-day free trial requires only an email address. Cancel anytime during the trial with no charge.
Can I change plans or add inboxes anytime?
Yes. Upgrades apply immediately; downgrades take effect at next billing cycle. Inboxes added mid-month are billed pro-rated from the day added.
How many inboxes can I manage?
No limit. Each inbox is billed at your plan rate. Volume discounts apply from 6 inboxes; 51+ inboxes are quoted per account.
What email providers are supported?
All major providers: Gmail, Google Workspace, Outlook, Microsoft 365, and any SMTP inbox. Integrations via OAuth or SMTP/IMAP credentials.
How long should I warm up an inbox?
For new domains, warm up for 3–6 weeks before heavy outreach. Recommended to keep synced as long as the inbox is actively used.
Is there a minimum commitment?
No. Cancel anytime from your account settings. No long-term contracts or hidden fees.
