When emails are sent from Report subscriptions in Classic mode, the email/envelope from the (return path) used in the email is the email address from the User record.
When emails are sent from Report subscriptions in Lightning Experience, the email/envelope from the (return path) is the "What email address would you like to use as your return address?" from the user's personal Email settings.
Check new release update information:
https://help.salesforce.com/s/articleView?id=release-notes.rn_rd_org_wide_email_address_for_report_subscriptions_ga.htm&release=256&type=5
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