What Is an SPF Record? Syntax, Limits and Failure Modes
An SPF record lists the servers allowed to send mail for your domain. Here is the syntax, the 10-lookup limit, forwarding failures and how to check yours.
Journal · #deliverability
4 articles tagged "deliverability".
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What Is DMARC? Alignment, Policies and the 2026 RFCs
DMARC tells receivers what to do when mail fails alignment. Here is how the record, policies and reports work, and what changed in 2026.
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Transactional vs Marketing Email: The Infrastructure Split
Transactional and marketing email look the same at the wire level. The infrastructure requirements diverge once you measure latency, complaint rates, and legal obligations.
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What Is DKIM? Email Authentication Standard Explained
DKIM adds an RSA cryptographic signature to every outbound email. The receiving MTA verifies it against your DNS-published public key before deciding where the message lands.
