WarmupSleuth quietly builds the sender reputation of your inbox — no work required on your end. Connect a mailbox and let Warmup Sleuth do the magic, so your real emails land in the inbox.
GDPR-native · EU-hosted · no credit card to start
We all know the hassle — hundreds of emails end up in spam every month and your prospects never see your offer. WarmupSleuth is here to fix it. Geeks or non-coders, everyone can improve their sender reputation.
Integrations for Google Workspace and Microsoft 365 inboxes, with SMTP/IMAP fallback for custom inboxes.
Separate scores for Google, Microsoft and Other inboxes. Spot divergence early — before one bucket tanks while others stay green.
Our warmup emails use simple text formatting — no redundant links, attachments or spam triggers. Not templates that ESPs catch in seconds.
Pick a ramp curve, set business hours and topics. The schedule respects your timezone and eases off on weekends.
Hosted in the EU with privacy built in. Right-to-export and right-to-delete out of the box — no add-ons, no surprises.
While we bring our network to full performance, we're in open Beta — planned for about two months. When it ends, you can go paid or leave the warmup environment.
Connect a mailbox, optionally drop in a template, and the warmup loop runs the rest. Your sender reputation accumulates over time.
Gmail, Microsoft 365, or any SMTP+IMAP provider. OAuth or app password — your call. Domain detection pre-fills the host and port.
The standard ramp covers most accounts. Draw your own curve if you've already started warming elsewhere.
Your reputation starts building within ~24 hours. The donut and per-ESP grid populate from there, and drift gets flagged early.
Connect a mailbox in two minutes and watch reputation build. Free for the first two Beta months.
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