Reach personal inboxes
Improve reach across the personal inboxes customers use every day, with placement results for each provider.
A lemwarm alternative for the whole campaign.
Prepare your sender and your next send. MailSlurp combines gradual warmup with inbox placement, device previews and content checks for your marketing team.
Trusted by teams at
Reach customers across every major inbox.
Build sending history gradually and check placement across available Gmail, Outlook, Yahoo, and other provider samples as your schedule progresses.
Track inbox, Promotions, spam, and not-received results throughout the ramp to make informed decisions before increasing campaign volume.
Improve inbox placement
Reach business inboxes
Check available Microsoft 365 and Google Workspace samples before increasing business email volume.
Move further from spam
Compare inbox and spam results over time to see whether your sender is ready for more volume.
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 while receipt, placement, and sender-health observations stay visible.
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
Use a measured recovery schedule to observe an existing sender and decide when to increase volume.
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.
Use each step to assess delivery before increasing volume. Placement also depends on your authentication, content, and recipient engagement.
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 your provider through a supported native integration or authenticated SMTP, then warm up the mailbox, domain, and identity used for your customer email.
Use SendGrid, Resend, Amazon SES, Mailgun, Postmark, Gmail, Microsoft 365, Yahoo, Zoho, Fastmail, Brevo, Mailjet, and more.
Connect your provider
Your sales inbox and newsletter can take different paths
Check the sender behind the campaign
A sales email might leave a connected Microsoft 365 mailbox while a newsletter leaves HubSpot's marketing infrastructure. Even when they use the same domain, a successful mailbox warmup does not establish how that newsletter will land.
Use MailSlurp to warm a supported sending connection and test the newsletter through its actual email platform. Our HubSpot warmup guide explains the separate mailbox, domain and dedicated-IP choices. Keep the result tied to the message and sender your audience will see.
Bring the finished email into the review
Send your campaign to a MailSlurp placement test to inspect provider folders. Then use device previews for phone and desktop layouts, and Email Audit for links and images. A plain-text warmup message and a designed newsletter answer different questions; MailSlurp gives your team a way to check both.
Switch with a plan for the sender you already have
Carry over context, then verify the connection
Start with the From address, sending provider, recent daily volume and normal sending hours. Connect the sender to MailSlurp and complete its test delivery. Choose a new-sender or recovery goal to match the situation, then review the daily target, time zone and maintenance settings. Account for existing campaigns and overlapping warmup schedules in the total volume. The schedule guide shows the available controls.
Read the first result before raising the target
If an active program has no sends yet, check its time zone and sending window first. It may be waiting for the next scheduled activity. If sends fail repeatedly, test the provider connection before adding volume.
Accepted sends show provider acceptance. Observed receipts show arrival in controlled test inboxes. Completed provider checkpoints show folder placement where that coverage is included. Read those results separately and use the warmup results guide to decide what needs investigation. Pause the program when a persistent sending problem needs attention.
Comparing lemwarm and MailSlurp?
Why choose MailSlurp as a lemwarm alternative?
MailSlurp brings native sender warmup, inbox placement testing, device previews and Email Audit into one platform. Your team can manage the sender's gradual increase and then inspect the campaign people will receive, including its folder placement, layout, links and images. Use the app for everyday review and the API for repeat checks.
Does lemwarm also offer deliverability checks?
Yes. lemwarm describes technical setup checks, deliverability reports, alerts and template warmup. MailSlurp's advantage for campaign teams is the connected workflow: warm the sender, test the actual campaign's placement, inspect it on real email clients and devices, and review content issues before launch. Read lemwarm's current feature and plan details.
How should I compare lemwarm pricing with MailSlurp?
Compare the workload you will actually run: connected senders, included sending credits, provider placement coverage and campaign checks. Include any warmup entitlement already bundled with your outreach subscription. MailSlurp warmup is available on Pro and Growth, with sending usage billed beyond included credits. Check current allowances before choosing a plan. See MailSlurp warmup plans.
Give your team a clearer view before send day.
Choose a warmup plan, then put your actual campaign through its checks.
