Quickly resolve Microsoft Outlook IMAP error code 0x800cccdd for Outlook 2016, 2013, 2010, 2007 etc. Know the reasons behind this error and best manual, automated. To resolve this issue in Outlook 2016 for Mac, install the February 2017 Outlook update (version 15.31.0) from the following Office website: Release notes for Office 2016 for Mac. To work around this issue, delete any cached passwords for your account, and also delete any modern authentication tokens from the keychain.

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 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 help you decide how to fix the problem.

Why did I get this bounce message?

The destination email 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 email address, your Exchange Online organization, or even all of Exchange Online) are being blocked by the recipient.

I got this bounce message. How do I fix it?

This section contains steps that you can try to fix the problem yourself.

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.

You're in the recipient's block list

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.com).

Contact the recipient (by phone, in person, etc.) to verify that your email 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 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.

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 email message.

Fix your Auto-Complete list entries in Outlook on the web

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:

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Remove a single recipient from your Outlook on the web Auto-Complete list

1. In Outlook on the web, click New mail.

2. Start typing the recipient's name or email address in the To field until the recipient appears in the drop-down list.

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3. Use the Down Arrow and Up Arrow keys to select the recipient, and then press the Delete key.

Remove all recipients from your Outlook on the web Auto-Complete list

You can only clear your Auto-Complete list in the light version of Outlook on the web. To open your mailbox in the light version of Outlook on the web, do either of the following steps:

• Open the mailbox in an older web browser that only supports the light version of Outlook on the web (for example, Internet Explorer 9).

• Configure 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):

  1. In Outlook on the web, click Settings .

  2. In the Search all settings box, type light and select Outlook on the web version in the results.

  3. In the page that opens, select Use the light version of Outlook on the web, and then click Save.

  4. Log off, close your web browser, and open the mailbox again in Outlook on the web.

After you open your mailbox in the light version of Outlook on the web, do the following steps to clear all entries from your Auto-Complete list:

1. Choose Options and verify that Messaging is selected.

2. In the E-Mail Name Resolution section, click Clear Most Recent Recipients list, and then click OK in the confirmation dialog box.

3. While you're still in Options, to return your mailbox to the full version of Outlook on the web, go to Outlook version, clear the check box for Use the light version, and then click Save.

4. Log off and close your web browser. The next time you open your mailbox in a supported web browser, you'll use the full version of Outlook on the web.

I'm an email admin. How do I fix this?

The Sender Policy Framework (SPF) record for your Exchange Online domain might be incomplete, and might not include all sources of mail for your domain. For more information, see Set up SPF in Office 365 to 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 this email address.

• Diagnostic information for administrators section: Recipient address rejected: SPF Permanent Error.

Still need help?

See also

MS Outlook, one of the most widely used email clients, has spread its roots in both Windows and Macintosh operating systems. While there have been several versions of MS Outlook in Windows OS, for Mac operating system only Outlook 2011 and Outlook 2016 are available.

Similar to Outlook for Windows, there are times, when a user encounters errors in Outlook for Mac. One common error that is encountered in Outlook for Mac is Error 17099. The following error message is shown when this error is encountered:

Relaying to prohibited by administrator email could not be sent

Cause of Error 17099

There are mainly two causes associated with the occurrence of this error:

1. This error mainly occurs when the SMTP server returns a permanent or transient error.
2. The second scenario when this error occurs is while sending a mail to a large number of users. Since the default limit is 50 users, in case the email is sent to more than 50 users at the same time, this error is encountered.

Workaround to Resolve Error 17099

This error can be resolved with the help of two methods. They are:

1. If Error is Due to SMTP Server

   This error can be resolved by rebuilding the identity database that can be done with the help of Microsoft Database Utility. For performing this process, follow the below-mentioned steps:

   1. Exit from all the applications that are running.
   2. Open Application folder and browse for MS Office 2011 to search for the Microsoft Database utility and double click on it.
   3. Click on the OLM file that has to be processed in Database Utility Window, and click on Rebuild.
   4. You will see a progress window displaying Rebuilding Main Identity.
   5. Once the process is completed, a message will be displayed “Your database was rebuilt successfully”
   6. Click on Done option.
2. If The Email Is Sent to Large Groups

   In case an email is sent to large groups in which the number of users is more than 50. For increasing the number of users from 50 recipients, you should contact the mail provider. The mail provider can increase the recipients per message and you can avoid getting these messages.

Conclusion

With the help of above mentioned procedures, we can overcome the occurrence of Outlook for Mac error code 17099.