Last updated 07-23-2026
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Boost Inbox
Boost Inbox is an email warmup service that gradually increases sending activity to build sender reputation and keep messages out of spam folders. It connects to Gmail, Outlook 365, Yahoo Mail, Amazon SES, and other providers through OAuth or SMTP, then runs automated warmup from your inbox.
The service sends realistic daily emails using GPT-generated content, opens and bookmarks messages, replies to a portion of them, and generates positive engagement signals. It reports on inbox health with analytics so you can track deliverability improvements over time. A free email health checker on the site lets you assess whether your address needs warmup before signing up.
Boost Inbox targets sales teams, marketers, and anyone running cold email outreach who needs reliable inbox placement. Plans cover one to eight mailboxes with 50 daily positive engagements per mailbox, status reports, human review, and premium support.
Connects Gmail, Outlook 365, Yahoo, Amazon SES, and SMTP inboxes in minutes with no technical setup
Sends realistic GPT-generated warmup emails daily with opens, bookmarks, and replies to boost reputation
Supports warming up multiple mailboxes at once for scaled outreach campaigns
Free email health checker to assess whether your address needs warmup before you buy
Detailed deliverability reports and inbox reputation analytics after warmup begins
Integrates with 1000+ apps through Zapier for workflow automation
Automates the full warmup process with realistic GPT-generated emails and human-like engagement
Works with major providers including Gmail, Outlook 365, Yahoo, and Amazon SES
Free email health checker helps you decide if warmup is needed before paying
Plans scale from one to eight mailboxes with transparent monthly and annual pricing
Low domain authority suggests a smaller brand footprint compared to established warmup tools
No free warmup tier beyond the health checker; all warmup plans require payment
Integrations rely on Zapier rather than native CRM or sales tool connections
Copyright footer still shows 2024, which may indicate less frequent site updates
What is email warmup and why does Boost Inbox offer it?
Email warmup gradually increases your sending volume so email providers trust your domain and route messages to the inbox instead of spam. Boost Inbox automates this process with realistic daily interactions from a network of real inboxes.
Which email providers does Boost Inbox support?
Boost Inbox works with Gmail and Google Workspace through OAuth, Microsoft Outlook 365, Yahoo Mail, Amazon SES, and custom SMTP connections. Setup takes about two minutes per inbox.
How much does Boost Inbox cost?
Monthly plans start at $5 for one mailbox, $9 for three mailboxes, and $19 for eight mailboxes. Annual plans are $50, $90, and $190 respectively, with two months free on yearly billing.
Does Boost Inbox offer a free email health check?
Yes. Boost Inbox includes a free email health checker that scores your address and shows whether you need warmup before starting a paid plan.
Can Boost Inbox warm up multiple accounts at once?
Yes. Team and Premium plans cover three and eight mailboxes respectively, each receiving 50 daily positive engagements. You can connect and warm multiple accounts simultaneously.