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I am running High Sierra on an old Mac. Recently my work email account through MS Exchange Online Plan1 stopped syncing with Mac Mail on my desktop. I tried to delete the account on Mail and create a new Exchange email account but it keep saying "cannot verify username or password". Any ideas please
iMac, macOS 10.12
Hello ramin138,
Welcome to Apple Support Communities!
If we understand your post correctly, you're getting an error message when trying to re-add an email account saying cannot verify username or password. We'd like to help!
First, restart your iMac. It's a simple step, but it can resolve unexpected issues. Then, try to add the email account again.
Why is Mail asking for your password?
Mail asks for your password when it is connecting to your email provider, but can't connect to your email account because your email provider isn't accepting your email password.
Your email provider may reject your password for several reasons, including:
• You're not using your current email password. If you updated the password on another device, make sure that you're using the same password on your Mac.
• Your email provider needs you to update or reset your password for security reasons. For example, if you're using Google’s two-step verification, your Gmail account in Mail requires the appropriate app-specific password.
• Your email provider deactivated or suspended your account. Contact your email provider for help.
If Mail on your Mac keeps asking for your password
If you are still getting the same error, we'd advise to contact your email provider, or the IT department, if your work has one. Let them know that you deleted the email account, but are unable to add it back again, due to a password error. There may be something on their end that needs to be done.
Let us know if you have any questions.
Thank you for using Apple Support Communities.
Take care!
My IT department told me that Exchange is no longer supporting High Sierra. My computer cannot be upgraded so unless Apple does something for Mail we are out of luck.
Cannot connect Mac Mail to MS Exchange email account
