Topic guide
Messaging compliance
Every glossary term attached to Messaging compliance, with the one-line answer for each.
A2P 10DLCLearn who needs A2P 10DLC, what Brand and Campaign registration asks for, how fees are shaped, and when another US messaging route fits better.BIMIBIMI logo signals, DMARC enforcement, and provider scope.CAN-SPAMUS commercial-email scope, requirements, and opt-out timing.CTIA Messaging PrinciplesVoluntary CTIA messaging guidance and opt-out expectations.DKIMDKIM signing, cryptographic requirements, and alignment.DMARCLearn how DMARC uses SPF or DKIM alignment and how to move from reports to enforcement without blocking legitimate senders.Domain reputationAuthenticated-domain reputation in Google reporting.Email deliverabilityInbox placement and delivery outcomes.Express written consentConsent scope and recordkeeping boundaries.Gmail bulk sender requirementsGmail's bulk-sender scope and published authentication requirements.IP reputationSending IP reputation and its provider scope.List-Unsubscribe headerList-Unsubscribe headers and one-click boundaries.One-click unsubscribeRFC 8058 headers and endpoint requirements.RCS agentLearn what an RCS agent represents, why its declared use case matters, and what to prepare for Google's launch review.RCS for BusinessUnderstand Google's RCS for Business platform, consent and launch requirements, and why a successful launch does not mean every phone is reachable.RCS verified senderUnderstand RCS brand verification, the sender checkmark in Google Messages, and why verification and recipient permission need separate checks.Sender reputationLearn how mailbox-provider reputation evidence differs, how domain and IP scope change the diagnosis, and what to check before changing infrastructure.SMS opt-inSMS permission scope and records.SMS opt-outSMS opt-out handling and reasonable revocation methods.SMS quiet hoursRecipient-local-time boundaries in the cited US provision.Spam complaint rateProvider-scoped complaint measurements and thresholds.SPFWhat SPF authorizes and what it does not prove.Suppression listAmazon SES suppression scope and reasons.TCPATCPA scope and consent boundaries for covered messaging.Toll-free verificationTwilio US and Canada toll-free verification scope.WhatsApp 24-hour windowLearn when WhatsApp Business Platform replies need a template, which message resets the service window, and what to check before a delayed reply.WhatsApp message templateUnderstand approved WhatsApp message templates, when they are needed, and what to review before reusing one for another send.WhatsApp opt-inUnderstand WhatsApp opt-in, review how permission is collected, and check how requests to stop messages reach your sending process.Yahoo sender requirementsYahoo authentication, unsubscribe, and spam guidance.