Use ItemSend instead of OnMessageSend #9
Merged
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OnMessageSend
warns if a handler takes time longer than 5 sec.https://learn.microsoft.com/en-us/office/dev/add-ins/outlook/onmessagesend-onappointmentsend-events?tabs=windows#long-running-add-in-operations
On the other hand,
ItemSend
accept long time handlers. So we decided to useItemSend
.Note that
ItemSend
always blocks to send a mail if there are some errors to load the addin.