Mail delivery fail when I Add events to Calendar

Copper Contributor


I have a Contoso tennant for Developer tasks


We are creating one web app for room reservations (using Microsoft Graph) in a corporation using 365 accounts


After some "ok" tests, the reservation has started to fail because the sender has been put in Spam list


the fail message email that the sender email account get is 

Your message wasn't delivered because the recipient's email provider rejected it.

Remote server returned '550 5.7.501 Service unavailable. Spam abuse detected from IP range...


The api we are using use the calendar

var res = await graphClient.Users[currUserId].Calendar.Events


Any trick to avoid this problem?


Thank you in advance


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