Web & Networking

SPF (Sender Policy Framework)

A DNS-based email-authentication standard that tells receiving mail servers which IPs are permitted to send mail for your domain. Missing or broken SPF causes legitimate email to land in spam.

Source

IETF — RFC 7208 — Sender Policy Framework

Related terms

HTTP Status Codes (2xx / 4xx / 5xx)

Three-digit response codes returned by HTTP servers.

Timeout

The maximum time a client waits for a response before giving up.

DNS (Domain Name System)

The internet's address book — translates human-readable domain names like foursight.cloud into IP addresses…

A Record

A DNS record that maps a hostname to an IPv4 address (e.g.

AAAA Record

Maps a hostname to an IPv6 address.

CNAME Record

An alias DNS record that points one hostname to another (e.g.

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