InboxPlan
InboxPlan: Private-network warmup with reply threads, mailbox coverage, and spam placement monitoring. Ranked #10 of 24 in Email Warmup Software by our editors (6.8/10); pricing: 7-day trial; best for small teams wanting low-cost private warmup.
At a glance
- Editor score6.8 / 10
- Pricing7-day trial
- Best forSmall teams wanting low-cost private warmup
- Free planNo
- Warmup networkPrivate
- Founded2022 · San Francisco, California, United States
- Facts checked20 Sep 2026
Where it wins
- Private seed network with human-like two-way reply threads
- Inbox-versus-spam monitoring plus spam rescue
- Supports Gmail, Outlook, Zoho, and custom SMTP/IMAP
Where it doesn't
- No free plan
- Paid plan structure is limited to the listed 1–4 inbox tier
- Daily volume ramps over time rather than offering a fixed maximum
Our verdict on InboxPlan
InboxPlan is an email warmup platform for sales teams, agencies, startups, and other businesses that need to build mailbox sending history. It connects Gmail, Google Workspace, Outlook, Microsoft 365, Zoho Mail, SendGrid, Amazon SES, and custom SMTP/IMAP mailboxes through a web interface. The service is designed to run alongside separate outreach or email-sending tools, making it a fit for teams managing several sending accounts rather than a replacement for an outreach platform.
Its main strength is the combination of automated message activity and placement visibility. InboxPlan generates AI-based warmup content, creates two-way reply threads, gradually increases sending volume, and lets teams configure a target daily send cap. Inbox-versus-spam monitoring shows where warmup messages are landing, while spam rescue addresses misplaced warmup emails. The private seed network adds a controlled environment for this activity. These features suit teams that want more than simple outbound volume, particularly when inbox placement is an important operational concern.
Mailbox coverage is broad, and multi-account management supports connected inboxes across several providers. The published plans show a 7-day trial and a paid 1–4 inbox tier focused on email warmup; there is no free plan. Daily volume is configurable and ramps over time, so teams should account for that operating model when planning warmup activity. InboxPlan is a sensible choice for small teams that need private-network warmup, placement monitoring, and support for mixed mailbox providers. Teams seeking a free option, a broader outreach suite, or a fixed daily-volume allowance should consider alternatives.
InboxPlan pricing
All 1 InboxPlan plans and prices →
InboxPlan fact sheet
| Free plan | No |
|---|---|
| Paid from | Not verified |
| Warmup network | Private |
| Daily email limit | Not verified |
| Mailbox providers | Not verified |
| Custom warmup schedule | Yes |
| Spam monitoring | Yes |
| Multiple mailboxes | Yes |
| Free trial | 7 days · card required |
| Money-back guarantee | 14 days |
| Deployment | Cloud |
| Platforms | Web |
| Support | Email, Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 8 integrations: Gmail, Google Workspace, Outlook, Microsoft 365, Zoho Mail, SendGrid … See all → |
| Pricing | 7-day trial (source) |
| Website | inboxplan.com |
| Facts checked | 20 Sep 2026 |
InboxPlan integrations
InboxPlan lists 8 integrations on its own site.
- Gmail
- Google Workspace
- Outlook
- Microsoft 365
- Zoho Mail
- SendGrid
- Amazon SES
- Custom SMTP/IMAP
See all InboxPlan integrations →
Alternatives to InboxPlan
- TrulyInboxBroad mailbox coverage, configurable warmup, and deliverability monitoring with a free plan.10.0
- WarmerlyA private-network warmup platform with a useful free tier and broad mailbox support.8.7
- WarmyA broad deliverability suite for teams managing warm-up, placement, reputation, and authentication.8.0
See all InboxPlan alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026
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