WarmupHero review
A free, Microsoft-focused warmup tool with useful analytics and narrow ecosystem coverage.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
WarmupHero is an email warmup service for users improving the deliverability of outbound campaigns. It progressively increases sending volume, exchanges warmup emails with real people, maintains conversation threads, and shows whether messages reach inboxes, spam, or category folders such as Promotions and Updates. It is especially suited to Microsoft-focused workflows through its Office 365 API connection, while other business email accounts can connect through SMTP and IMAP details.
Pricing is straightforward: the Free plan is included with all SmartReach plans. The published offer combines progressive email warmup automation with inbox, spam, and category-folder analytics, sequential sending, threaded replies, spam-folder recovery, and important marking. Custom warmup signatures, images, and links provide control over the messages used in the warmup process. WarmupHero is available through the web and a Chrome extension.
Its main strength is the depth of its warmup workflow: conversation-thread maintenance, replies, human exchanges, and folder-level reporting go beyond simple volume increases. Office 365 API support also gives Microsoft users a direct connection option. The tradeoff is a narrow ecosystem, with SmartReach.io listed as the integration and a shared warmup network rather than a dedicated one. Users seeking Microsoft-focused warmup with no separate WarmupHero charge should consider it; teams needing broader platform coverage or a standalone paid plan should look elsewhere.
WarmupHero pros and cons
- Where it wins
- Progressively increases sending volume with human-like sequential emails
- Tracks inbox, spam, and category-folder placement
- Supports Office 365 API connections and spam-folder recovery
- Where it doesn't
- The warmup network is shared rather than dedicated
- Integration coverage centers on SmartReach.io
- The Free plan is bundled with SmartReach plans
WarmupHero fact sheet, pricing and score →
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