Outlook - Cannot resolve recipient

Bruce Yang 0 Reputation points

When replying an email, there's an error message and the replied email can't be sent. The error message is showed as below.

Screenshot 2023-10-16 225900

After some tries, that the error is caused because of some of the recipients that the name starts with Chinese characters. Deleted those recipients, that the email reply can be sent with no error. And if type the email directly, the message can be sent as well.

How to resolve this error?

A family of Microsoft email and calendar products.
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  1. SokiGuo-MSFT 23,871 Reputation points Microsoft Vendor

    Hi @Anonymous

    In order to better study this issue, please provide more details:

    Are you the only user in your organization experiencing this issue?

    What is your account type (Exchange/POP/IMAP)?

    Did you add other accounts in the Outlook client in the same profile as your Office 365 account? This issue occurs when a Google Apps Sync for Outlook account and an Exchange Server account are configured in the same Outlook profile. More information, see: The operation failed error when you send email messages in Outlook - Outlook | Microsoft Learn.

    Here are some suggestions for your reference:

    1. Switch to Online mode and then click "Empty auto-complete list" again. Click File->Options->Mail->Send Messages, and then click the Empty Auto-Complete List button.
    2. Open outlook in safe mode to check if there any add-ins cause this issue.
    3. Repair Office application.

    A similar thread on this issue for your reference: Outlook 2016 Cannot resolve recipient.

    Hope this helps!

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