The following procedure requires you to access your mailbox in the light version of Outlook Web App. 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 until the recipient is displayed in the drop-down list. You can also find more information at Remove suggested name or email address from the Auto-Complete List in Outlook Web App. To remove recipients from the auto-complete list in Outlook Web App, perform one of the following procedures. Although the recipient's email address is the same, other internal identifiers for the recipient may have changed, thus making your cached entry for that recipient invalid. For example, the recipient may have been moved from an on-premises Exchange organization to Exchange Online or vice-versa. This list is also known as the nickname cache. You may have selected an item from your Auto-Complete List that is no longer working correctly. Take out bad entries in the Auto-Complete List This is the likely cause if you can successfully send messages to other recipients in the same domain.Īsk the recipient to verify that your email address isn't on their block list. Your email address could be on the recipient's personally-maintained block list. Remove the sender from the recipient's block list For more information about how to verify your SPF record, see Customize an SPF Record to Validate Outbound Email Sent from Your Domain.

The Sender Policy Framework (SPF) record for your domain may be incomplete, and may not include all sources of mail for your domain. If the procedures here don't help, contact your Admin and refer them to this information so they can try to resolve the issue for you. Some of these procedures are designed for an Office 365 email administrator and not the average email sender. Note: Message delivery from server-to-server can be complicated or require special access to settings.

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