MailSlurp resources
Guides - Page 6
Practical guides for MailSlurp messaging, testing, reliability, extract, account setup, and procurement workflows.
Posts
Port 25: What It Is, Why It Gets Blocked, and What To Use Instead
Learn what port 25 is for, why cloud providers often restrict it, how it differs from ports 587 and 465, and when SMTP relay on port 25 is still appropriate.
Read moretechnicalGoogle Workspace MX Records: Setup, Verification, and Common Mistakes
Learn which Google Workspace MX records to publish, how to verify Gmail routing after DNS changes, and which migration mistakes break inbound mail.
Read moretechnicalSPF Verification Guide: How to Check and Validate SPF Records
Learn how SPF verification works, how to check an SPF record correctly, and how to interpret pass, fail, softfail, and neutral results.
Read moretechnicalSpam Filter Guide: How Email Spam Filters Work and What They Flag
Learn how spam filters evaluate email, which signals trigger filtering, and how teams can test auth, content, and sender reputation before they send.
Read moretechnicalOutlook SMTP Settings Guide: Server, Port, TLS, and Common Errors
Learn the typical Outlook SMTP settings, how Outlook.com differs from Microsoft 365, and how to troubleshoot auth and relay failures safely.
Read moretechnicalMX Records Guide: What Mail Exchanger Records Do and How to Check Them
Learn what MX records are, how mail exchanger priority works, and how to check MX setup when domains are not receiving mail as expected.
Read moretechnicalIMAP vs POP3: Differences, SMTP Fit, Ports, and Testing Workflow
Compare IMAP vs POP3, understand where SMTP fits, choose the right protocol, and test real email workflows with inbox receipt and header evidence.
Read moretechnicalHow Does Email Work? From SMTP Submission to Inbox Retrieval
Learn how email works step by step, from application submit and MX routing to inbox retrieval, spam filtering, and delivery monitoring.
Read moretechnicalEmail Verifier Guide: How to Verify Email Addresses and Reduce Bounces
Learn what an email verifier actually checks, the difference between syntax, domain, and mailbox validation, and how to use verification without making bad assumptions.
Read moretechnicalEmail Spam Checker Guide: What to Test Before You Send
Learn what an email spam checker actually evaluates, how to test headers, content, and auth together, and how to catch common spam risks before release.
Read moretechnicalEmail Hosting Guide: What It Is, What It Includes, and What It Does Not Replace
Learn what email hosting includes, how it differs from transactional email APIs, and when businesses need mailbox hosting plus testing, delivery, or verification services.
Read moretechnicalEmail Deployment Guide: How to Ship Email Changes Without Breaking Deliverability
Learn what email deployment really includes, how to validate templates and sender changes before release, and which rollback and monitoring steps reduce production risk.
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