MailSlurp resources
Guides - Page 10
Practical guides for MailSlurp messaging, testing, reliability, extract, account setup, and procurement workflows.
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Parts of an Email Address: Local Part, @, Domain and Aliases
Learn the parts of an email address, how the local part and domain work, and why aliases, normalization, and validation rules affect signup, routing, and deliverability.
Read moretechnicalOffice 365 DKIM Setup: Enable DKIM in Microsoft 365 Without Guessing the CNAMEs
Set up DKIM for Office 365 and Microsoft 365 custom domains without copying stale examples. Learn where Microsoft exposes the required CNAMEs, how selectors work, and how to verify live signing.
Read moretechnicalMessage Undeliverable: What It Means, Common Causes, and How to Fix the Real Failure
Learn what a message undeliverable error usually means, how to separate recipient, policy, size, and routing failures, and how to troubleshoot before blindly resending.
Read moretechnicalGoogle Workspace SMTP Relay: Setup, Ports, Auth, and Safe Testing
Set up Google Workspace SMTP relay without confusing it with smtp.gmail.com. Learn when to use smtp-relay.gmail.com, which ports and auth modes apply, and how to validate relay changes safely.
Read moretechnicalGoogle Workspace DMARC: Setup, Alignment, and Safe Rollout for Gmail Senders
Set up Google Workspace DMARC without treating it like a standalone TXT record. Learn how Gmail sender requirements, SPF, DKIM, alignment, and gradual enforcement fit together.
Read moretechnicalGoogle Workspace DKIM Setup: Generate the TXT Record, Turn It On, and Verify It
Set up Google Workspace DKIM without guessing. Learn how to generate the record in the Admin console, publish the TXT value, turn on signing, and verify real Gmail headers.
Read moretechnicalGoDaddy DMARC Setup: Add the Record, Avoid DNS Mistakes, and Verify It Works
Set up DMARC in GoDaddy without guesswork. Learn which host to use, what the TXT record should look like, how to avoid duplicate records, and how to verify the policy before it affects live mail.
Read moretechnicalEmail Types Explained: Transactional, Marketing, Lifecycle, Notification, and Support
Learn the main email types, how they differ, and what teams should test for transactional, marketing, lifecycle, security, support, and operational email.
Read moretechnicalEmail Security Best Practices for Sender Identity, User Trust, and Safer Workflows
Use practical email security best practices to reduce spoofing, account abuse, unsafe links, auth drift, and release risk across transactional, support, and internal email workflows.
Read moretechnicalEmail Protocols Explained: SMTP, IMAP, POP3, and Where APIs Fit
Learn the main email protocols, what SMTP, IMAP, and POP3 each do, and how to choose the right send, receive, and sync model for apps, support, QA, and product email.
Read moretechnicalEmail Hygiene: How To Keep Lists Clean Without Hurting Growth
Learn what email hygiene actually includes, how it affects deliverability and sender reputation, and which operational controls keep lists healthy over time.
Read moretechnicalEmail Deliverability Issues: Common Causes and Fast Fixes
Diagnose email deliverability issues such as spam placement, auth drift, blacklist exposure, complaint spikes, and broken workflows with a practical remediation sequence.
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