Outlook Error 550 5.1.0
for error code 5.1.0 in Office 365 Applies To: Office 365 Admin, Less Applies To: Office 365 Admin , More... Which version do I have? More... This topic will walk you through the steps of what to do if you see status code 550 5.1.0 or just 5.1.0 in a non-delivery report (NDR) or delivery status notification (DSN) message. There can be several issues that cause NDR 5.1.0 and some solutions for the issue of recipient address rejected: SPF Permanent Error are provided in this topic. It will be useful to use the information in the status notification to decide how to fix the problem. What happened to cause Exchange NDR 5.1.0 or status code 5.1.0 and what does this error mean? The mail server that generated the NDR 5.1.0 error won't accept messages from the sender or for the recipient. This can happen if the sender's email address, IP address, or email service provider is being blocked. Tips for fixing the problem that is causing Exchange NDR 5.1.0 or address rejected: SPF Permanent Error Try the following procedures, and then see if you can successfully send the email message. Note: Message delivery from server-to-server can be complicated or require special access to settings. Some of these procedures are designed for an Office 365 email administrator and not the average email sender. 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. Fix an incorrect SPF record The Sender Policy Framework (SPF) record for your domain may be incomplete, and may not include all sources of mail for your domain. For more information about how to verify your SPF record, see Customize an SPF Record to Validate Outbound Email Sent from Your Domain. Remove the sender from the recipient's block list Your email address could be on the recipient’s personally-maintained block list. This is the likely cause if you can successfully send messages to other recipients in the same domain. Ask the recipient to verify that your email address isn't on their block list. If it is on a block list, remove it. Take out bad entries in the Auto-Complete List You may have selected an item from your Auto-Complete List that is no longer working correctly. This list is also known as the nickname cache. For example, the recipient may have been moved from an on-premises Exchange organization to Exchange Online or vice-versa. 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. If you're using Outlook
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