If multiple on-send add-ins are installed, the add-ins will run in the order in which they are received from APIs getAppManifestCall or getExtensibilit圜ontext. However, if the on-send feature is enabled and available but the mailbox scenario is unsupported, Outlook won't allow sending. In cases where Outlook add-ins don't activate, the on-send add-in won't run and the message will be sent.
In addition to situations where add-ins don't activate as noted in the Mailbox items available to add-ins section of the Outlook add-ins overview page, the functionality is not currently supported for offline mode where that mode is available. On-send functionality is only supported for user mailboxes in Outlook on the web, Windows, and Mac.
Consider the effects on performance when you create add-ins that require multiple message- or meeting-based operations.
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.