However it requires enabling it tenant wide or per mailbox. SMTP AUTH ( SMTP.Send) - works fine even with shared mailboxes, needs a separate token for consent and sending ( scope).It's possible to create a email draft and upload the attachment with upload session, however it requires Mail.ReadWrite permissions and does not work with shared mailboxes (thats a known bug). Microsoft Graph API ( Mail.Send, ) - there is a 4MB total HTTP request size limitation (base64 encoding limits the practical attachment size to 3MB).The idea is that an app should be able to send an email as user (or potentially, a shared mailbox), but can't access existing messages inside user's mailbox. I'm trying to find more ways to send big emails (with many large attachments) through Exchange Online.
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