MailSlurp resources
Email API, deliverability, and QA engineering blog - Page 5
Tactical writing for teams building reliable email and SMS workflows in development, CI, and production operations.
Posts
SPF Checker: How to Validate SPF Records and Fix Common Failures
Learn how to use an SPF checker to validate SPF records, inspect include chains, fix multiple-record problems, and troubleshoot sender authorization failures.
Read moretechnicalSMTP Server Configuration Checklist: Host, Port, TLS, Auth, and DNS
Configure SMTP correctly with a practical checklist for host, port, TLS, authentication, sender identity, and testing from staging to production.
Read moretechnicalSMS Verification API for OTP and MFA Testing
Learn how an SMS verification API supports OTP and MFA testing, what workflows teams should validate, and how to avoid flaky auth automation.
Read moretechnicalSendGrid Alternative: How To Compare Options by Workflow, Testing, and Inbound Email
Evaluate a SendGrid alternative by outbound delivery, inbox testing, inbound handling, sender diagnostics, and workflow ownership so you choose a platform that matches how your team actually ships email.
Read moretechnicalSelenium Email Testing for Transactional Flows and MFA
Learn how to use Selenium email testing to verify signup, password reset, OTP, and MFA flows with real inboxes and deterministic message assertions.
Read moretechnicalPlaywright Email Testing and Email Verification for OTP, Magic Links, and Password Resets
Learn how to do Playwright email testing and Playwright email verification with real inboxes and phone numbers so you can verify OTP codes, magic links, password resets, and transactional messages in CI.
Read moretechnicalPHP Email Validation Guide: Syntax, Domain Checks, and Real Verification
Learn how to validate email addresses in PHP with filter_var, when to use DNS checks, why regex alone is weak, and how to verify real email flows before release.
Read moretechnicalPhone Verification API for Test Automation Teams
Learn how a phone verification API supports signup, login, recovery, and MFA test automation with programmable numbers, deterministic waits, and real message assertions.
Read moretechnicalOTP testing and OTP checker workflows for email, SMS, magic links, and MFA
Use OTP testing and OTP checker workflows to validate email codes, SMS verification, magic links, MFA, expiry, resends, and one-time use.
Read moretechnicalNBSP Character Explained: How To Use Non-Breaking Spaces in HTML and Email
Learn what the NBSP character means, how ` ` works in HTML, when to use non-breaking spaces, how it differs from normal spaces, and how to debug formatting problems in web pages and email templates.
Read moretechnicalMX Record Lookup Guide: How to Verify Email Routing and Troubleshoot Delivery
Learn what MX records do, how to check them with dig and nslookup, how MX interacts with SPF, DKIM, and DMARC, and how to verify email routing safely.
Read moretechnicalMailto Link Guide: Syntax, HTML Examples, Parameters, and Better Alternatives
Learn how a mailto link works, how to build mailto syntax in HTML and JavaScript, how to encode subject and body fields correctly, and when to use an email API instead.
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