What is iMessage availability check?
An iMessage availability check is a lookup that determines whether a phone number or email address can receive iMessages before you send to it.
Checking first tells you what share of a list will land as blue bubbles, which changes how you write the campaign and what results to expect.
It also protects sending patterns: routing known non-iMessage numbers straight to their correct channel avoids wasted sends and failed-delivery noise.
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