iMessage not sending in iMac

Hi michaelrobbins,

Welcome to Apple Support Communities. I see your issue above and am happy to help. To start, go through this article and make sure everything looks right - If you can’t send or receive messages on your Mac - Apple Support

I look forward to hearing from you!

Cheers,

Jack

In that case, let's try these settings:

1. If you know your WiFi Password, go to System Preferences > Network > WiFi > Advanced > Select your WiFi name and hit the minus sign.
2. Click OK.
3. Reconnect to your WiFi network in that same window.
4. Go to the "Messages" app > Click "Messages" (in the top left menu bar) > iMessage > Sign Out
5. Sign back into iMessage
6. Try again

Let us know!

Cheers,

Jack

In that case, unplug the ethernet cable, restart your iMac, reconnect the cable, and follow these steps:

1. Go to the "Messages" app > Click "Messages" (in the top left menu bar) > iMessage > Sign Out
2. Sign back into iMessage
3. Try again

Jack,

Those steps don't work. iMessage will not send any messages. It will receive messages, but it will NOT send them.