If you verify that all your account settings are correct, but you still can't send messages, try turning on SMTP authentication. Some email services, including iCloud mail accounts, require authentication for their SMTP server. Solution: Turn on SMTP authentication for the POP or IMAP account. Cause: Some POP and IMAP email accounts use an outgoing mail (SMTP) server that requires authentication. On the Outlook menu, make sure that Work Offline is not checked. For information about checking the status of your network connections, see Mac OS Help. If you are on a local network, see whether you can access intranet sites. Use a Web browser to see whether you can access Internet sites.

Solution: Make sure that your computer is connected to the Internet or your network. Cause: Outlook doesn't have a connection to the Internet or your network. If the Apple ID doesn't match, you can tap on it and follow the prompts to sign out, then sign in with the same Apple ID you used on your iPhone.Note: Are you using Outlook for Windows? Visit I can't send or receive messages in Outlook for help.

It's very important that you select the same item for the Start new conversations from option at the bottom of the screen as you did on your iPhone.

If that's the case, then select select your phone number and any email addresses you added on your iPhone.

Open Settings > Messages > Send & Receive and check to make sure the same Apple ID you used on your iPhone is being used on your iPad.

Now that you have iMessage set up on the iPhone, you need to verify the same information is used on your remaining Apple devices. Select your phone number or an email address as what you want to Start new conversations from.

If you opt to select an email address as well, a new option will appear at the bottom of the screen.

Doing so will prevent a lot of confusion and avoid messages inadvertently syncing to one device.

I suggest picking just your phone number as what you will use to send and receive messages.

Below will be your phone number along with any email addresses you have associated with your Apple ID.

At the top of the page is the Apple ID used on your iPhone for iMessage - make note of it.Open Settings > Messages > Send & Receive on your iPhone.

Why are my messages on mac not working