Open the mailbox in an older web browser that only supports the light version of Outlook on the web (for example, Internet Explorer 9).Ĭonfigure your Outlook on the web settings to only use the light version of Outlook on the web (the change takes effect the next time you open the mailbox): To open your mailbox in the light version of Outlook on the web, do either of the following steps: You can only clear your Auto-Complete list in the light version of Outlook on the web. Remove all recipients from your Outlook on the web Auto-Complete list Use the Down Arrow and Up Arrow keys to select the recipient, and then press the Delete key. Start typing the recipient's name or email address in the To field until the recipient appears in the drop-down list. To remove recipients from your Auto-Complete list in Outlook on the web (formerly known as Outlook Web App), do one of the following procedures: Remove a single recipient from your Outlook on the web Auto-Complete list Fix your Auto-Complete list entries in Outlook on the web To resend the message in Outlook, see Resend an email message. To remove invalid recipients or all recipients from your Auto-Complete list in Outlook 2010 later, see Manage suggested recipients in the To, Cc, and Bcc boxes with Auto-Complete. Fix your Auto-Complete list entries in Outlook
Although the recipient's email address is the same, other internal identifiers for the recipient might have changed, thus breaking your cached entry for the recipient. For example, the recipient might have been moved from an on-premises Exchange organization to Exchange Online, or vice-versa. You might have an invalid entry in your Auto-Complete list (also known as the nickname cache) for the recipient. Remove bad entries from your Auto-Complete List This is the likely cause if you can successfully send messages to other recipients in the same domain (for example, the recipient (by phone, in person, etc.) to verify that your email address isn't in their block list. Your email address could be in the recipient's personally-maintained block list. If these steps don't fix the problem for you, contact your email admin and refer them to this topic so they can try to resolve the issue for you. This section contains steps that you can try to fix the problem yourself. This can happen if messages from you (your email address, your Exchange Online organization, or even all of Exchange Online) are being blocked by the recipient. The destination email server that generated the 5.1.0 error won't accept messages from you (the sender) or messages for the recipient. Use the information in the NDR to help you decide how to fix the problem. This topic describes what you can do if you see error code 550 5.1.0 or 5.1.0 in a non-delivery report (also known as an NDR, bounce message, delivery status notification, or DSN). It's frustrating when you get an error after sending an email message.
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