MailSlurp resources
Guides - Page 8
Practical guides for MailSlurp messaging, testing, reliability, extract, account setup, and procurement workflows.
Posts
Microsoft SNDS: Setup, Reputation Signals, and How To Use It
Learn how to set up Microsoft SNDS, which Outlook sender signals it exposes, how to interpret reputation and trap data, and how to act on it without guessing.
Read moretechnicalHow to Whitelist an Email in Gmail, Outlook, and Office 365
Learn how to whitelist an email in Gmail, Outlook, and Office 365, what safe-sender rules actually do, and why allowlisting does not replace sender authentication.
Read moretechnicalGmail SMTP Server Settings: smtp.gmail.com, Ports, Auth, and Testing
Configure Gmail SMTP server settings with smtp.gmail.com, port 465 SSL or 587 TLS, app passwords, Workspace relay choices, and MailSlurp validation.
Read moretechnicalEmail Schema: Gmail Markup, JSON-LD, and How To Test It
Learn what email schema means, how schema.org markup works in Gmail, and how to test structured actions, auth, and delivery before launch.
Read moretechnicalEmail File Size Limit Guide: Attachment Caps, Gmail Limits, and Practical Sending Rules
Learn how email file size limits really work, why attachments grow during encoding, what Gmail size limits mean in practice, and how to test large-email workflows safely.
Read moretechnicalEmail Deliverability Best Practices for Reliable Inbox Placement
Follow practical email deliverability best practices for sender authentication, recipient quality, inbox placement, spam control, and release-safe workflow testing.
Read moretechnical550 Permanent Failure Blocked: What It Means for One or More Recipients and How To Fix It
Learn what `550 permanent failure blocked` and `550 permanent failure for one or more recipients` usually mean, which recipient and policy problems trigger them, and how to fix the message path without guesswork.
Read moretechnicalWhy Am I Not Receiving Emails? Missing Mail Troubleshooting
Diagnose email sent but not received incidents by checking spam placement, mailbox rules, sender authentication, routing, and delivery evidence.
Read moretechnicalWhat Is the Body of an Email? Meaning, Structure, Examples, and Testing
Learn what the body of an email is, how it differs from headers and subjects, and how to test, extract, and automate email body content.
Read moretechnicalWhat Is SSL for Email? TLS, STARTTLS, and What Email Encryption Actually Protects
Learn what people mean by SSL for email, why modern systems really use TLS, how STARTTLS differs from implicit TLS, and what email transport encryption does and does not secure.
Read moretechnicalWhat Is PTR? Reverse DNS, Email Sender Identity, and Why Receivers Care
Learn what a PTR record is, how reverse DNS works, and why PTR matters for email sender identity, spam filtering, and deliverability troubleshooting.
Read moretechnicalWhat Is BIMI? How Brand Indicators Work and What You Need Before Rollout
Learn what BIMI is, how it connects brand logos to authenticated email, which DNS and DMARC prerequisites matter, and what results to expect in real inboxes.
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