Stop landing in spam because of a setup issue you didn’t know you had

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1 in 5 outbound emails fails due to infrastructure issues

Sending from a domain inbox providers don't trust
Ramping up volume before your mailbox is ready
Authentication gaps you didn't know were there

Get a sending domain and inbox ready to send in minutes, not days.

Already have a domain? Connect it in seconds. Need a new one? Buy it directly in lemlist. Either way, authentication is set up automatically and you're ready to send.

Earn inbox providers' trust before your campaign asks for it.

lemwarm automatically exchanges real emails with real inboxes to build your sender reputation. You set the pace, it handles the rest.

Send at the right volume so you never look like a spammer.

lemlist caps daily sending per inbox and pauses automatically before you hit unsafe limits. Set sending windows by timezone so your emails land when prospects are actually at their desk.

Gmail talks to Gmail. Outlook to Outlook. Inbox providers trust their own.

Land more reliably by matching your sender to your prospect's email provider, with zero configuration needed.

Catch setup issues before they quietly kill your open rates.

Watch deliverability health across warmup, outreach, and inbox placement. When something shifts, alerts tell you before it costs you replies. The tech audit then shows you exactly what's wrong per mailbox, ready to fix.

Frequently Asked Questions

Most emails that land in spam aren't badly written. They come from domains that were never properly configured. Without the right authentication records, inbox providers like Gmail and Outlook have no reason to trust you, and they won't give you the benefit of the doubt.
You can, but it's risky. If a cold outreach campaign damages your sender reputation, it affects every email your company sends, including sales proposals and customer communications. A separate sending domain keeps your main domain protected.
A brand new inbox that suddenly sends hundreds of emails a day looks exactly like a spam operation to inbox providers. Warmup solves this by building your sending history gradually, so by the time your campaign goes out, Gmail and Outlook already trust you.
Inbox providers track your daily sending patterns. A sudden spike from one inbox, even with great content and a clean list, gets flagged as suspicious. Keeping volume consistent and within safe limits is one of the simplest ways to protect your sender reputation as you scale.
Your emails either go straight to spam or get rejected entirely, and you have no idea why. Most teams find out weeks later when open rates have already tanked. lemlist's health check surfaces these issues upfront, before you ever press send.