May 18, 2020 This tool lets you choose Outlook for Mac as your default mail application. Then Outlook opens a new email whenever you click on a mailto: link in an email or website. Reset Recent Addresses This tool lets you reset recent addresses that Outlook has stored, and delete recent addresses all at once, instead of one at a time.

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

1. Step 10 - Create a user profile in Outlook. To create a user profile, follow these steps: In Control Panel, select Programs, select User Accounts, and then select Mail to open Mail items. Select Show Profiles. Select the profile that you want to remove, and then select Remove. In the Profile Name dialog box, type a name for the profile. Specify the user name, the primary SMTP.
2. Features not yet available in the new Outlook for Mac. There are several features that are available in the current version of Outlook for Mac for Office 365 that aren't yet available in the new Outlook experience. S/MIME - Now available in Beta Channel version 16.43.

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”

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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.

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.

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

• 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

Original KB number: 3146087

Symptoms

You use Microsoft Outlook 2016 for Mac or Outlook for Mac 2011 to connect to a mailbox on a Microsoft Exchange server. When you send an email message that contains a large attachment, you receive the following error messages in Outlook for Mac.

Or, you receive a non-delivery report (NDR) in your Inbox like this one:

The message contains diagnostic information for administrators, such as the following:

Remove Server returned '500 5.2.11 RESOLVER.RST.SendSizeLimit.Sender; message too large for this sender'

Cause

This issue occurs when you send an email message that's larger than the Exchange Web Services (EWS) message size limit that's configured on the Exchange server.

Resolution

You can increase the message size limit on the Exchange server to allow for larger email messages to be sent from Outlook for Mac clients and other EWS clients. For more information, see the following TechNet articles as appropriate for your version of Exchange Server.

Exchange Server 2016 and 2013: Configure client-specific message size limits

Exchange Server 2010: Set message size limits for Exchange Web Services

Not That Many Messages Outlook Mac

More information

For more information about this issue, see the following article in the Microsoft Knowledge Base:

Outlook Mac Error Not That Many Messages

3107326 You can't send large attachments by using the EWS client