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Question: I cannot send Messages from my mac

I've always been able to send iMessages from my mac until just yesterday. New messages can be seen on the mac but I can no longer respond to them. When I type in the message I get an error message "Not Delivered" along with a red exclamation mark in a circle. I've quit and re-started the app and looked online but can't find any helpful hints that work. I am running High Sierra Version 10.13.3. and is completely up to date. Any suggestions?

iMac, iOS 11.2.6

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Mar 9, 2018 8:46 AM in response to tomas2 In response to tomas2

Have you tried signing out of Messages and then sign back in?

Try the Safe Mode.

Safe Mode - About El Capitan
also Sierra

Safe Mode Startup – El Capitan. also Sierra

If it works in the Safe Mode, try running this program when booted normally and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read. Click “Share Report” button in the toolbar, select “Copy to Clipboard” and then paste into a reply. This will show what is running on your computer. No personal information is shown.

Etrecheck – System Information

Messages Troubleshooting - Basic

Mar 9, 2018 8:46 AM

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Question: I cannot send Messages from my mac