what about Office365? My company's using office365 as email service provider, I've added several full emails in 'Individual Email Addresses' with green marks shown, but still failed with 5.1.0 - Unknown address error 550-'5.1.1 bad mailbox name'.The email address is memm9f2qh4@privaterelay.appleid.com
Topic:
App & System Services
SubTopic:
General
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