You should filter with single quotes (' '
).
To filter based on individual senders:
https://graph.microsoft.com/v1.0/me/messages?$filter=from/emailAddress/address eq '******@abbvie.com'
To filter based on multiple senders:
https://graph.microsoft.com/v1.0/me/messages?$filter=from/emailAddress/address eq '******@abbvie.com' or from/emailAddress/address eq '******@def.com'
Hope this helps.
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