-->
Symptoms
In Microsoft Outlook 2016 for Mac, you are repeatedly prompted for authentication while you're connected to your Office 365 account.
One of the common issue that Outlook users face majorly in MS Outlook 2016 is “Outlook inbox showing unread messages” even if messages are not there. This blog elaborates this issue so that users will be able to resolve it. MS Outlook is one of the most common email clients that is used in various organizations. Outlook for Mac is in Offline Mode Resolution. If Outlook for Mac is offline then, you cannot send.
To set preferences for how conversations are displayed in the message list, on the Outlook menu, click Preferences, and then under Email, click Reading. Under Conversations, select the preferences that you want. Messages in the Junk E-Mail and Deleted Items folders are not included in conversations. Reason – Error 452 Or 452 4.5.3 in Outlook Application Mostly this error arises by your Internet Service Provider as Outlook application does hold any limits on email address while sending messages to a large number of people. This is done by ISP Provider to avoid spamming emails, that used to send single emails to hundreds of user. 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.
Cause
This issue occurs because of the presence of duplicate tokens in the keychain.
Resolution
To resolve this issue in Outlook 2016 for Mac, install the February 2017 Outlook update (version 15.31.0) from the following Office website:
Workaround
To work around this issue, delete any cached passwords for your account, and also delete any modern authentication tokens from the keychain. To do this, follow these steps.
Note
These steps affect all Office applications that use modern authentication.
Quit Outlook and all other Office applications.
Start Keychain Access by using one of the following methods:
- Select the Finder application, click Utilities on the Go menu, and then double-click Keychain Access.
- In Spotlight Search, type Keychain Access, and then double-click Keychain Access in the search results.
In the search field in Keychain Access, enter Exchange.
In the search results, select each item to view the Account that's listed at the top, and then press Delete. Repeat this step to delete all items for your Exchange account.
In the search field, enter adal.
Select all items whose type is MicrosoftOffice15_2_Data:ADAL:<GUID>, and then press Delete.
In the search field, enter office.
Select the items that are named Microsoft Office Identities Cache 2 and Microsoft Office Identities Settings 2, and then press Delete.
Quit Keychain Access.
Note
When you start Outlook, you are prompted to authenticate.
This blog section deal with common but most frequently asked questions on different forum sites that “Too many recipients In Outlook” or “Error 452”. Here we discuss, how this problem issues arise and how we can deal with to fix this issue.
Error 452 Or 452 4.5.3 – Too many recipients In Outlook 2016,2013, 2010, 2007
This error occurs when an Outlook user sends single emails to multiples user at a time and message not sent to the delivered address. For Example, A Outlook user want to send mail to distribution groups that includes hundreds of user address but while sending the message, user start getting message “Too Many Recipients in Outlook”
Reason – Error 452 Or 452 4.5.3 in Outlook Application
Not That Many Messages Outlook Mac
Mostly this error arises by your Internet Service Provider as Outlook application does hold any limits on email address while sending messages to a large number of people. This is done by ISP Provider to avoid spamming emails, that used to send single emails to hundreds of user.
Different types of Restriction can be applied by ISP Administrator to limit the messages sending by the user.
1) Either it Depends on, “How many recipients can be addressed for single mail”
2) You can send the number of emails in a Single hour.
3) Number of Emails, you can send in One Day.
This limitation is done to avoid any kind of spamming or abusive user of Server services. Contact your ISP administrator to know what kind of policy used to send/receive emails.
Outlook Mac Error Not That Many Messages
Solution to Fix Error 452 Or 452 4.5.3 & Too many recipients In Outlook 2016,2013, 2010, 2007 Version
Note: Before start fixing this issues, please contacts your ISP administrator to know, is there any limit or permission applied it or not.
Common tips to avoid these Error 452:
1) Reduces the number of recipients from the Distribution list.
2) Also can split the Distribution group in two so that you can move half number of user recipient to newly created List and help you to avoid “Too many recipients in Outlook 2016, 2013, 2010” Issues.
Conclusion
The following two tabs change content below.- Too many recipients In Outlook – Error 452 Fixed - August 3, 2018
- How to Fix Cyclic Redundancy Check (CRC) Error of Exchange Backup File - November 24, 2015
- How to Reset User Mailbox Password In Exchange 2010 - November 2, 2015