Restrictions on large groups : Groups with more than 5, members have the following restrictions automatically applied:. If the steps in the earlier sections don't solve the issue for the sender, the solution likely requires action by the recipient's email admin.
The scenarios and solutions are described in this section. If only this recipient is having difficulty accepting messages from external senders, configure the recipient or your email servers to accept messages from external or anonymous senders. When the recipient is a mail-enabled public folder in your Exchange Online organization, an external sender will receive an NDR with the following error code:.
AuthRequired; authentication required [Stage: CreateMessage]'. Open the Exchange admin center EAC. For more information, see Exchange admin center in Exchange Online.
Choose a public folder from the list, and then click Edit. For more information, see exchange admin center in exchange online. In the public folder properties dialog box that opens, go to Mail flow settings , and configure the following settings in the Accept messages from section:. In this case, the NDR the sender receives would include information in the Diagnostics for administrators section similar to the following information:.
To remove the restriction on the sender's source email system, forward the NDR message to delist messaging. Also see Use the delist portal to remove yourself from the blocked senders list. Check with your domain registrar or DNS hosting service to verify the MX record for your domain is correct. Verify you have only one MX record configured for your domain. Microsoft doesn't support using more than one MX record for a domain that's enrolled in Exchange Online.
The Sender Policy Framework SPF record for your domain might be incomplete, and might not include all email sources for your domain. For more information, see Set up SPF to help prevent spoofing. I am sure we are all familiar with the lack of a reverse lookup for a mail server, but some ISP's are also checking to see if an email account is valid before receiving the message.
This validation is done by looking up the MX record for a given domain and then checking the mail server listed in the MX record to verify that the sender has an account on that machine. Most mail servers will respond to this query. Once it is known that the user does exist in the mail domain, the mail is received and delivered to the appropriate box. If the server does not respond to this query or the senders account does not exist on the server referenced in the DNS MX record for that domain, the DNR error message is issued.
If you have more than one MX record for domain make sure the records are valid and the priorities are properly set.
This will fix a lot of the problems. If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem.
Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.
Please note: Do not post advertisements, offensive material, profanity, or personal attacks. Please remember to be considerate of other members. It's frustrating when you get an error after sending an email message.
This topic describes what you can do if you see error code 5. The destination email server that generated the 5. 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.
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. Your email address could be in 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 for example, fabrikam.
Contact the recipient by phone, in person, etc. 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 Exchange Online, or vice-versa.
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. To remove invalid recipients or all recipients from your Auto-Complete list in Outlook later, see Manage suggested recipients in the To, Cc, and Bcc boxes with Auto-Complete.
As a result, the recipient server can identify if emails are from the valid domain. If there are no DKIM records, some mail servers assume that the sender is fake and reject the email. When there is a mismatch, we correct it by making required changes in these records.
This includes incorrect MX entry for the recipient domain, suspended or disabled recipient email account, custom blacklists or filters configured on the recipient side, etc. If we notice missing MX entries or connection problems on the receiver side, then this must be fixed at the receiver side. In case of custom blacklists or filters, the sender domain needs to be whitelisted at the recipient end to allow mail flow.
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