Blog
Mailmark Blog
Practical articles on email infrastructure for developers: DNS, authentication, Amazon SES, deliverability, and campaigns.
AWS SES Production Access: How to Get Out of the Sandbox
Request AWS SES production access step by step: the console form, the CLI call, what to prepare, how to track the review, and what to do if it stalls.
Oct 22, 2026 · 7 min read
DNS Records for Email: MX, SPF, DKIM and DMARC Setup
Every DNS record your domain needs to send and receive email on Amazon SES: 3 DKIM CNAMEs, MX, SPF, DMARC, and MAIL FROM, with exact values and fixes.
Oct 22, 2026 · 5 min read
SPF, DKIM, and DMARC Explained: How Email Auth Works
How SPF, DKIM, and DMARC work together: what each record checks, why alignment decides DMARC, a worked example on Amazon SES, and a safe path to p=reject.
Oct 22, 2026 · 4 min read
Email Campaign Best Practices: A Checklist for 2026
Email campaign best practices that hold up: pick one goal, meet CAN-SPAM and Gmail rules, personalize properly, and measure replies, not opens.
Oct 22, 2026 · 4 min read
Email Deliverability: How to Reach the Inbox, Not Spam
What decides email deliverability in 2026: Gmail, Yahoo, and Outlook sender rules, bounce and complaint limits, warmup, and list hygiene, with sources.
Oct 22, 2026 · 5 min read
Why Are My Emails Going to Spam? 8 Causes and Fixes
Find out why your emails are going to spam: read the authentication results, then check the 8 usual causes, from broken DMARC to blocklists, with fixes.
Oct 22, 2026 · 4 min read