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SPECIFICTION
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InboxPlan

inboxplan.com

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Spec score 7.7 #18 of 24 in Email Warmup Software

What it is

InboxPlan is a web service for automated email warm-up, scheduling, and deliverability monitoring. It creates warm-up messages and simulated two-way conversations tailored to a user's industry, then schedules activity with randomized send windows and a gradual increase in volume. InboxPlan says sending typically starts at 3–5 emails per day in week one and reaches 30–50 per day by week four; users can set manual limits for each account. A live monitor tracks sender score, inbox placement, and spam rates across major providers. Users can connect Gmail, Outlook, Zoho, or custom SMTP accounts and warm multiple mailboxes in one workspace, subject to the plan's account allowance. Each account receives its own threads, schedule, and reputation dashboard. InboxPlan says it uses OAuth and does not store account passwords. It names sales teams, agencies, and startups among its intended users, as well as businesses in SaaS, recruiting, real estate, finance, and e-commerce. The service is paid, with no free plan, and offers a 7-day free trial that requires a credit card. InboxPlan was founded in 2022 and is headquartered in San Francisco, California.

Spec sheet

Purpose
InboxPlan provides automated email warm-up, smart scheduling, and deliverability analytics to help emails reach the inbox.Read 4 Oct 2026 · inboxplan.com
Intended users
The homepage names sales teams, agencies, and startups, and lists SaaS, recruiting, real estate, finance, and e-commerce businesses among its audiences.Read 3 Oct 2026 · inboxplan.com
Trial
The homepage advertises a 7-day free trial and says a credit card is required.Read 4 Oct 2026 · inboxplan.com
Integrations
The site says users can connect Gmail, Outlook, Zoho, or custom SMTP accounts.Read 3 Oct 2026 · inboxplan.com
Headquarters
San Francisco, California, United StatesRead 28 Sep 2026 · inboxplan.com
Founded
2022Read 28 Sep 2026 · inboxplan.com
Account security
InboxPlan says it uses standard OAuth and does not store users' passwords.Read 3 Oct 2026 · inboxplan.com
AI conversations
Its AI generates unique, human-like business conversations for warm-up threads.Read 4 Oct 2026 · inboxplan.com
AI warm-up
Its AI generates unique warm-up emails and coherent conversation threads tailored to the user's industry.Read 3 Oct 2026 · inboxplan.com
Authentication
InboxPlan says it uses OAuth and does not store users’ passwords.Read 4 Oct 2026 · inboxplan.com
Deliverability monitoring
A live health monitor tracks sender score, inbox placement, and spam rates across major providers.Read 3 Oct 2026 · inboxplan.com
Health monitoring
The live health monitor tracks sender score, inbox placement, and spam rates across major providers.Read 4 Oct 2026 · inboxplan.com
Multi-account support
Users can connect multiple accounts, with each account getting its own warm-up threads, send schedule, and reputation dashboard, subject to the plan.Read 3 Oct 2026 · inboxplan.com
Multiple accounts
The site says users can warm multiple accounts in one workspace, subject to their plan’s account allowance.Read 4 Oct 2026 · inboxplan.com
Reply simulation
InboxPlan simulates two-way AI conversations to create engagement signals.Read 4 Oct 2026 · inboxplan.com
Scheduling
Smart scheduling randomizes send windows and ramps volume automatically.Read 4 Oct 2026 · inboxplan.com
Seed network
InboxPlan says its private seed network includes 500+ verified inboxes across major email providers.Read 4 Oct 2026 · inboxplan.com
Sending limits
Warm-up typically starts at 3–5 emails per day in week one and scales to 30–50 per day by week four, with manual per-account limits available.Read 4 Oct 2026 · inboxplan.com
Setup
InboxPlan says setup takes under two minutes.Read 4 Oct 2026 · inboxplan.com
Supported connections
The site says users can connect Gmail, Outlook, Zoho, or custom SMTP accounts.Read 4 Oct 2026 · inboxplan.com
Warm-up volume
InboxPlan says it typically starts at 3–5 emails per day in week one and scales to 30–50 per day by week four.Read 3 Oct 2026 · inboxplan.com

Strong points and limits

Strong points

  • Schedules randomized sending windows and ramps volume.
  • Monitors sender score, inbox placement, and spam rates.
  • Connects Gmail, Outlook, Zoho, and custom SMTP.
  • Provides separate dashboards for connected accounts.
  • Uses OAuth and says it does not store passwords.

Limits

  • No free plan is available.
  • The 7-day trial requires a credit card.
  • Multiple-account allowance depends on the plan.

Who it suits

InboxPlan suits sales teams, agencies, startups, and businesses seeking email warm-up and deliverability monitoring. It supports several email providers and custom SMTP, with multiple accounts available subject to plan limits.

Verdict

InboxPlan combines automated warm-up activity with monitoring and per-account controls. Consider the plan's account allowance and the credit-card requirement for its 7-day trial before signing up.

Where Specifiction places it

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