Share via
It's frustrating when you get an error after sending an tin nhắn message. This topic describes what you can tự 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).
Use the information in the NDR to tát help you decide how to tát fix the problem.
Why did I get this bounce message?
The destination tin nhắn server that generated the 5.1.0 error won't accept messages from you (the sender) or messages for the recipient. This can happen if messages from you (your tin nhắn address, your Exchange Online organization, or even all of Exchange Online) are being blocked by the recipient.
|
I got this bounce message. How tự I fix it? | 
|
I'm an tin nhắn admin. How tự I fix this? | 
|
Details for error code 5.1.0 |
I got this bounce message. How tự I fix it?
This section contains steps that you can try to tát fix the problem yourself.
If these steps don't fix the problem for you, tương tác your tin nhắn admin and refer them to tát this topic ví they can try to tát resolve the issue for you.
You're in the recipient's block list
Your tin nhắn address could be in the recipient's personally-maintained block list. This is the likely cause if you can successfully send messages to tát other recipients in the same tên miền (for example, @fabrikam.com).
Contact the recipient (by phone, in person, etc.) to tát verify that your tin nhắn address isn't in their block list.
Remove bad entries from your Auto-Complete List
You might have an invalid entry in your Auto-Complete list (also known as the nickname cache) for the recipient. For example, the recipient might have been moved from an on-premises Exchange organization to tát Exchange Online, or vice-versa. Although the recipient's tin nhắn address is the same, other internal identifiers for the recipient might have changed, thus breaking your cached entry for the recipient.
Fix your Auto-Complete list entries in Outlook
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.
To resend the message in Outlook, see Resend an tin nhắn message.
Fix your Auto-Complete list entries in Outlook on the web
To remove recipients from your Auto-Complete list in Outlook on the trang web (formerly known as Outlook Web App), tự one of the following procedures:
Remove a single recipient from your Outlook on the trang web Auto-Complete list
In Outlook on the trang web, click New mail.
Start typing the recipient's name or tin nhắn address in the To field until the recipient appears in the drop-down list.
Use the Down Arrow and Up Arrow keys to tát select the recipient, and then press the Delete key.
Remove all recipients from your Outlook on the trang web Auto-Complete list
You can only clear your Auto-Complete list in the light version of Outlook on the trang web. To open your mailbox in the light version of Outlook on the trang web, tự either of the following steps:
Open the mailbox in an older trang web browser that only supports the light version of Outlook on the trang web (for example, Internet Explorer 9).
Configure your Outlook on the trang web settings to tát only use the light version of Outlook on the trang web (the change takes effect the next time you open the mailbox):
In Outlook on the trang web, click Settings
.In the Search all settings box, type light and select Outlook on the trang web version in the results.
In the page that opens, select Use the light version of Outlook on the web, and then click Save.
Log off, close your trang web browser, and open the mailbox again in Outlook on the trang web.
After you open your mailbox in the light version of Outlook on the trang web, tự the following steps to tát clear all entries from your Auto-Complete list:
Choose Options and verify that Messaging is selected.
In the E-Mail Name Resolution section, click Clear Most Recent Recipients list, and then click OK in the confirmation dialog box.
While you're still in Options, to tát return your mailbox to tát the full version of Outlook on the trang web, go to tát Outlook version, clear the kiểm tra box for Use the light version, and then click Save.
Log off and close your trang web browser. The next time you open your mailbox in a supported trang web browser, you'll use the full version of Outlook on the trang web.
I'm an tin nhắn admin. How tự I fix this?
The Sender Policy Framework (SPF) record for your Exchange Online tên miền might be incomplete, and might not include all sources of mail for your tên miền. For more information, see Set up SPF to tát help prevent spoofing.
Details for error code 5.1.0
The NDR from Exchange Online for this specific error might contain some or all of the following information:
User information section: Address Rejected. A problem occurred during the delivery of this message to tát this tin nhắn address.
Diagnostic information for administrators section: Recipient address rejected: SPF Permanent Error.
Still need help?
See also
Email non-delivery reports in Exchange Online