MailSlurp guides

Bulletproof Email Buttons: Outlook and Mobile Checks

Keep email buttons readable with images off and usable on phones. Review Outlook fallbacks, dark mode, tracked links and tap areas before sending.

Email Accessibility Checklist for Marketing Teams

Check email contrast, reading order, alt text, links and mobile layouts. Use a practical accessibility review alongside real email-client previews.

Email Preheader Text: Make the Inbox Preview Worth Reading

Write useful email preheader text, check what Gmail and Outlook display, and prevent your inbox preview from filling with footer or browser-link text.

Email Seed Lists: Run a Placement Test You Can Trust

Build an isolated email seed test in your ESP, use the current MailSlurp marker, catch excluded recipients and read provider placement correctly.

Email Spam Trigger Words: What Actually Needs Fixing

Learn why a spam-word list cannot predict inbox placement. Diagnose misleading content, links and sender problems with controlled campaign tests.

GoHighLevel Email Warmup: Understand the Stage Before Sending More

Separate HighLevel domain warmup from LC Email account limits and mailbox warmup. Check the actual campaign before expanding your sends.

Inbox Placement Rate: Calculate It Without Hiding Missing Emails

Calculate inbox placement rate, separate Primary and Promotions, account for missing seeds, and compare provider results without misleading averages.

IP Warming in Salesforce Marketing Cloud

Plan IP warming in Salesforce Marketing Cloud Engagement, account for journeys and business units, and test campaign placement before expanding.

Plain-Text Email: Check the Version Behind Your HTML Campaign

Test plain-text emails for stale offers, missing links and broken personalization. Includes Mailchimp and HubSpot checks for marketing teams.

SendGrid IP Warmup: Setup and Campaign Checks

Understand SendGrid automated IP warmup, connect a verified sender to MailSlurp, and check campaign placement before increasing volume.

Why Your Campaign Emails Go to Junk in Outlook

Diagnose Outlook junk placement by separating Outlook.com, Microsoft 365 policy, authentication, sender reputation and mailbox rules.

Email Images Not Showing? Keep Your Offer and CTA Readable

Tell blocked pictures from broken image links, see a real missing-image test, and make your campaign understandable before customers download the artwork.