For anyone else searching for an answer to this. The below is how you accomplish. Use Q for quotes printable taken from https://datatracker.ietf.org/doc/html/rfc1342
SendMail symbols in subject line
Barone, Lou
56
Reputation points
When sending emails via SMTP you are able to inject images into the subject line, doing something similar to the below. I am trying to understand if there is a way to emulate this when sending a rest call to graph for sendMail.
$subject = "=?utf-8?Q? =F0=9F=8C=9F CONGRATULATIONS!"
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Barone, Lou 56 Reputation points
2022-08-23T15:37:22.513+00:00 -
Barone, Lou 56 Reputation points
2022-08-23T15:12:24.137+00:00 This article goes over it from a spec standpoint. Just trying to see how to emulate this over the json\rest\graph post.