Is iMessage outreach legal?
Yes. No law bans business outreach over iMessage. What the law regulates is business texting as a category: the TCPA applies to texts sent to mobile numbers on every channel, iMessage included, so you need a valid consent basis, clear opt-out handling, and respect for quiet hours. The channel is legal; sloppy consent practice is what creates exposure.
The rulebook is the same one that governs SMS marketing. The TCPA does not name channels, it names conduct: automated texts to mobile numbers require consent appropriate to the message type, and a stop request must be honored fast. State mini-TCPA laws layer their own rules on top, several of them stricter than the federal floor.
What iMessage changes is the carrier layer, not the legal one. A2P 10DLC registration is carrier plumbing for SMS routes and does not apply to iMessage, but registration was never the thing making texting legal or illegal. Consent was. The two get conflated constantly, and the distinction is spelled out in Do I need A2P registration?
The full sourced legal breakdown, including the B2B grey areas, damages math, and the state laws worth knowing, is in Is iMessage marketing legal? This page is general information rather than legal advice; run your program past counsel.
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