MailSlurp resources
Guides - Page 2
Practical guides for MailSlurp messaging, testing, reliability, extract, account setup, and procurement workflows.
Posts
Gmail Spam Filter: Why Gmail Flags Emails and How To Fix It
Learn how Gmail spam filtering works, why legitimate messages land in spam, and how to test authentication, content, reputation, and inbox placement before release.
Read moretechnicalWhy Do Emails Go To Spam? A Practical Guide To Diagnosis and Fixes
Learn why emails go to spam, why legitimate emails still land there, and how to diagnose authentication, routing, reputation, content, and list-quality issues before they become delivery incidents.
Read moretechnicalWhat Is an IMAP Server? Meaning, Ports, Setup, and Troubleshooting
Learn the meaning of an IMAP server, how it handles incoming mailbox sync, which ports it uses, and how to troubleshoot common IMAP access problems.
Read moretechnicalWhat Is an Email Alias? Meaning, Forwarding, and When To Use One
Learn what an email alias is, how alias addresses work, how they differ from forwarding and plus addressing, and when teams should use them for privacy, routing, and testing.
Read moretechnicalOffice 365 SMTP Settings: Server, Port, TLS, Auth, and Testing
Configure Office 365 SMTP settings for smtp.office365.com, port 587, STARTTLS, mailbox auth policy, relay choices, and safe MailSlurp validation.
Read moretechnicalMTA and SMTP: How Mail Transfer Agents Use SMTP To Move Email
Learn how MTA and SMTP fit together, where mail submission ends and relay begins, and how to test routing, queues, retries, and delivery behavior safely.
Read moretechnicalMicrosoft 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.
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