why are all my text message from my IOS "not delivered"
why are messages I sent from my Mac show "not delivered"
iMac, OS X 10.11
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If you have an iPhone and it is signed in to the same Apple ID as your Mac, you can send or receive text messages on your Mac. If you don't have an iPhone, you can still send text messages but only through your Apple ID to other Apple devices.
With the iPhone, to set this up, the following steps have to be followed, exactly:
iMessage checklist
iPhone and Mac both logged in to same Apple ID. Try logging off and logging on if necessary.
iPhone Settings => Messages shows iMessage as "on" (sometimes toggling this off and then on fixes some things)
iPhone Settings => Messages shows Send & Receive showing both phone number and email (Apple ID)
iPhone Settings => Messages shows Text Message Forwarding and your Mac is listed and shown as "on" there.
iPhone Settings => Messages shows Send as SMS "on" and MMS Messaging and Group Messaging both "on"
On the Mac: Messages => Preferences => iMessage tab shows same and correct Apple ID and "You can be reached for messages at" indicates both phone number and Apple ID (email), and "start new conversations from" indicates the phone number.
* Don't see the Text Message Forwarding setting on your iPhone? Go to Settings > Messages, turn off iMessage, turn it back on, tap Send & Receive, tap Use Your Apple ID for iMessage, then sign in with the same Apple ID used on your other devices.
Forward SMS/MMS text messages from your iPhone to your Mac or iPad - Apple Support
