Reach personal inboxes
Improve reach across the personal inboxes customers use every day, with placement results for each provider.
Warm up your sender. Reach more inboxes.
Build sender reputation gradually so more email lands in the inbox, stays out of spam, and reaches customers across Gmail, Outlook, Yahoo, and every major provider.
Trusted by teams at
Reach customers across every major inbox.
Warmup builds the sending history mailbox providers use to decide where your email belongs. Strengthen placement across Gmail, Outlook, Yahoo, Microsoft 365, Google Workspace, iCloud, Proton Mail, and more.
Track real inbox, Promotions, spam, and not-received results throughout the ramp, so important campaigns launch with stronger placement from the start.
Improve inbox placement
Reach business inboxes
Build the reputation needed to reach Microsoft 365 and Google Workspace accounts with stronger placement.
Move further from spam
Watch spam signals fall as healthy sending history grows and more messages earn their place in the inbox.
Build the reputation behind every campaign.
New and recovering senders need a record of consistent, successful delivery. MailSlurp creates that history before launches, promotions, lifecycle messages, and customer notifications depend on it.
Volume grows in measured steps, receipt and placement results stay visible, and sender health is protected as the mailbox earns trust.
Build sender reputation
Grow without sudden spikes
Increase sending volume in steady steps that build trust instead of triggering the reputation damage caused by abrupt spikes.
Keep the sender healthy
Keep authentication, domain health, and blocklist signals in view while the sender builds a stronger delivery record.
Recover lost trust
Rebuild an existing sender with a measured recovery path that restores reputation and improves placement over time.
Protect deliverability while volume grows.
MailSlurp uses controlled inbox receipts, delivery failures, domain health, Gmail Postmaster data, and placement tests to choose the next target. Strong signals keep the ramp moving; weaker signals slow it before customer reach drops.
Every increase serves one goal: build sustainable inbox placement without sacrificing the reputation already earned.
Start adaptive warmup
Know exactly where mail lands
Measure inbox, Promotions, spam, and not-received outcomes instead of treating provider acceptance as the finish line.
Catch placement changes early
See when inbox reach changes during the ramp and adjust before important customer campaigns are affected.
Keep the team ahead
Bring placement changes into Slack or Microsoft Teams so the people protecting deliverability can act quickly.
Warm up every sender you already use.
Connect every mail provider through native integrations or authenticated SMTP, then build reputation on the same mailbox, domain, and identity that will send real customer email.
Use SendGrid, Resend, Amazon SES, Mailgun, Postmark, Gmail, Microsoft 365, Yahoo, Zoho, Fastmail, Brevo, Mailjet, and more.
Connect your provider
Email warmup questions
Better placement, stronger sender reputation, and more customer reach from every warmup program.
How does MailSlurp email warmup improve deliverability?
MailSlurp builds the positive sending history mailbox providers use to trust a sender. It increases volume gradually, confirms real delivery to controlled inboxes, tracks placement across major providers, and adapts the pace to keep reputation moving in the right direction. Read the email warmup guide.
Will email warmup help more messages reach the inbox?
Yes. MailSlurp strengthens the sender reputation and delivery history behind every campaign, helping more messages reach the inbox instead of spam as volume grows.
Which sending providers can I connect?
Connect every mail provider. Use native connections for SendGrid, Resend, Mailgun, and Postmark, or authenticated SMTP for Amazon SES, Gmail, Google Workspace, Microsoft 365, Yahoo, Zoho, Fastmail, Brevo, Mailjet, and more. See provider setup details.
Which inbox providers can I track during warmup?
Track placement across Yahoo Mail, Gmail, Google Workspace, Outlook.com, Microsoft 365, Proton Mail, iCloud, and other major inbox providers. Compare inbox, Promotions, spam, and not-received results throughout the ramp.
Can I warm up a new sender and recover an existing sender?
Yes. Start a new mailbox or domain with a measured reputation-building plan, or use a recovery plan to rebuild trust and restore placement for an existing sender.
Can MailSlurp keep protecting deliverability after warmup?
Yes. Keep testing inbox placement, monitoring SPF, DKIM, DMARC, MX, and blocklists, and checking campaign content as real sending volume takes over. Explore deliverability monitoring.
Give every campaign a better chance to reach the inbox.
Start free, build sender trust, improve placement, and reach more customers before the send that matters.
