01
Connect your sender
Use your own mail account or sending service. Connect it with provider credentials or authenticated SMTP, then verify the connection with a delivery test.
Warm up your sender. Reach more inboxes.
MailSlurp sends paced warmup emails through your own sender so you can build sending history and review delivery before increasing volume. Create a free account; warmup sending requires Pro or Growth, with usage billed beyond included credits.
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How email warmup works
Connect your sender, increase volume gradually, and review delivery and placement. Illustrative examples; results vary by sender and provider.
02
Set a steady pace
Choose a new-sender or recovery schedule, daily volume, time zone and sending window. Add maintenance sending after the ramp, and pause or adjust the schedule when needed.
03
Follow the evidence
Review accepted sends and delivery activity. Eligible plans add provider placement samples so you can compare inbox and spam counts before increasing volume.
Warm up the sender you actually use.
Connect SendGrid, Resend, Mailgun or Postmark directly, or use authenticated SMTP with services such as Amazon SES, Google Workspace and Microsoft 365. Warmup messages travel through your sending account.
MailSlurp sends varied warmup messages to controlled inboxes on your schedule. Start gradually with a new sender, or use a recovery schedule to observe an existing sender at lower volume. You control the daily target, sending window and optional maintenance, and can pause or stop the run.
Check your sender setup
See the evidence before increasing volume.
An accepted send confirms that your sending service accepted the message. Placement checkpoints show where sampled copies arrived. Review both alongside your domain authentication, message quality and recipient engagement.
Eligible plans sample Gmail, Google Workspace, Outlook.com and Microsoft 365. Follow the inbox and spam counts across checkpoints. Warmup does not guarantee inbox placement or move promotional messages into Primary.
Understand warmup results
Email Quality
Check how your emails look and where they land.
- 100 client previews / month
- 25 inbox placement tests / month
- Email audits, monitoring and warmup tools
$79/ month · USD
One person included
View packageThe trial covers previews and placement. Warmup senders and activity are paid separately.
Start in Sandbox for freeEmail warmup questions
Learn how gradual sending, provider samples, and ongoing monitoring work together.
Can I start with a free account?
Yes. Create your MailSlurp account for free. Running warmup sends requires Pro or Growth, with sending usage billed beyond your included credits. Review sender capacity and usage pricing before starting a schedule. See warmup plans.
How does MailSlurp email warmup improve deliverability?
MailSlurp increases sending volume gradually, confirms delivery to controlled inboxes, and uses available delivery and placement signals to adjust the pace. Review these observations alongside your authentication, message quality, and recipient engagement. Read the email warmup guide.
Will email warmup help more messages reach the inbox?
A gradual schedule helps you evaluate a sender before increasing volume. Mailbox providers decide placement using many signals, including reputation, authentication, content, and recipient engagement. Warmup does not guarantee inbox placement.
Which sending providers can I connect?
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?
Eligible plans add placement checkpoints at Gmail, Google Workspace, Outlook.com and Microsoft 365. These are sampled observations from the accounts included in each checkpoint. Compare inbox and spam results over time; they do not predict where every customer will receive your email.
Can I warm up a new sender and recover an existing sender?
Yes. Choose a gradual schedule for a new mailbox or domain, or use a recovery schedule to observe an existing sender at lower volumes before increasing traffic.
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.
Start with a free account. Build a steadier sending routine.
Create your account for free, then choose Pro or Growth to run warmup sends. Review included sender capacity and credits before starting; additional sending usage is billed separately.
