Trouble while sending large amounts of mail via Outlook REST API

Question

I'm using Outlook REST API to send mail. When I try to send 7000 emails via Outlook api, there are 78 mails cannot be sent and moved to draft folder. I wonder if it is default action of outlook api or it is an error ? Thank you !

Answer 1

You may be running into message send limits as documented here: https://technet.microsoft.com/en-us/library/exchange-online-limits.aspx#RecipientLimits If you believe you are within the documented limits, let me know and we can investigate further.