On-send functionality is only supported for user mailboxes in Outlook on the web, Windows, and Mac.

Send Later (Mac only) – If there are on-send add-ins, the Send Later feature will be unavailable.Īlso, it's not recommended that you call item.close() in the on-send event handler as closing the item should happen automatically after the event is completed.

Consider the effects on performance when you create add-ins that require multiple message- or meeting-based operations.

Performance – Multiple roundtrips to the web server that hosts the add-in can affect the performance of the add-in.

If you have two or more ItemSend events in a manifest, the manifest will fail validation. Manifest – Only one ItemSend event is supported per add-in.Add-ins that use the on-send feature should be deployed by administrators. AppSource – You can't publish Outlook add-ins that use the on-send feature to AppSource as they will fail AppSource validation.Append-on-send feature – If you call in the on-send handler, an error is returned.The on-send feature currently has the following limitations. The following screenshot shows an information bar that notifies the sender that blocked words were found. The following screenshot shows an information bar that notifies the sender to add a subject. In Outlook on the web, when the on-send feature is triggered in a message being composed within the Outlook browser tab, the item is popped out to its own browser window or tab in order to complete validation and other processing. The following table shows supported client-server combinations for the on-send feature, including the minimum required Cumulative Update where applicable. The on-send feature is triggered by the ItemSend event type and is UI-less.įor information about limitations related to the on-send feature, see Limitations later in this article. Add a specific recipient to the CC line in messages, or to the optional recipients line in meetings.Prevent a user from sending sensitive information or leaving the subject line blank.

For example, you can use the on-send feature to: The on-send feature for Outlook add-ins provides a way to handle a message or meeting item, or block users from certain actions, and allows an add-in to set certain properties on send.

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