Get time back when you’re all caught up with what’s new in your Focused Inbox. Free with Outlook for iOS Connect. Get things done on the go with Outlook mobile. Work efficiently with email, calendar, contacts, tasks, and more—together in one place. Office integration lets you share. 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. 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”. 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. While all Outlook 2016 emails are stored in Group Containers messages are not stored by folder. Your best option is to export these emails as.olm file or try dragging individual folders to Desktop as.mbox files as backup. Your best option is NOT store anything locally.
-->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.
Outlook Mac Error Not That Many Messages
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:
3107326 You can't send large attachments by using the EWS client