Email & DNS
2026-11-06
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9 min read
·
Manuel Rubio
How to Keep Your Email Out of the Spam Folder
A technical guide to the SPF, DKIM, and DMARC trinity: RFC standards, practical DNS configuration, and protecting your sending reputation.
Sending an important email only to have it vanish into the recipient's spam folder is one of the most frustrating and costly challenges in modern communications. Major mailbox providers like Google, Yahoo, Microsoft, and Apple enforce strict authentication thresholds: if your domain does not rigorously prove its identity, your messages will be demoted to spam or rejected outright at the SMTP boundary.
#Email
#SPF
#DKIM
#DMARC
#Deliverability
#DNS
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