Suddenly iMessages won't send to contacts who don't have iPhones.
Is anyone else experiencing trouble with iMessage not sending to cell phones that are not iPhones?
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The Messages app works with either iMessages or SMS text messages. The latter is used to send texts to non-Apple devices. In order to send SMS messages from your Mac, the Mac has to be "synced" with an iPhone. There may be something amiss with this connection.
To double-check that everything is set up properly, please take a look at the following article: