Likely you (SendGrid) have been blacklisted for spamming.
You can try filling out this form, submit, and wait for a response to get off their blacklist.
https://support.microsoft.com/en-us/getsupport?oaspworkflow=start_1.0.0.0&wfname=capsub&productkey=edfsmsbl3
If you get an error during submittal it is because you've put in too much info in one of the text fields. Correct before submitting again.
https://answers.microsoft.com/en-us/outlook_com/forum/all/sendgrid-says-emails-delivered-but-customers-with/62de80ab-c006-4507-86d1-708d255c996d
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