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The documentation for onSend support in office add-ins states:

The on send feature is currently supported for Outlook on the web in Office 365 (in preview), Exchange 2016 on-premises (Cumulative Update 6 or later), and Exchange 2019 on-premises (Cumulative Update 1 or later). This feature is also available in preview on Windows and Mac connected to an Office 365 subscription. Add-ins that use the on send feature aren't allowed in AppSource.

I'm wondering if the onSend feature will support the following configuration: Office 2016/2019 (not connected to 365) with Exchange 2016 on-premises. Office 2016/2019 (not connected to 365) with Exchange via 365

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Answering your question in sections, 1.Office 2016/2019 (not connected to 365) with Exchange 2016 on-premises Yes, provided you are on CU 6 and later 2.Office 2016/2019 (not connected to 365) with Exchange via 365 Are you referring to exchange Online? (which is the non on-prem case). Could you elaborate a bit more?Outlook Add-ins Team - MSFT
Regarding my second configuration: "Office 2016/2019 (not connected to 365) with Exchange via 365" I mean an email account that uses "outlook.office365.com" as its exchange server. I'm not sure if that is "exchange online" or not? Your answer that Office 2016/2019+Exchange 2016 on-prem being supported is different than the answer I received here: github.com/OfficeDev/outlook-dev-docs/issues/…. Thank you for the reply!freddyz

1 Answers

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Availability of onSend on different platforms

Please find the image explaining availability of onSend on different platforms