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During the migration phase, both Exchange Online and our local Notes servers will respond to our domain. However, e-mails sent from an Office 365 user to a Notes user are considered as spams by our servers. Do you know a way to avoid this by configuring our servers or Exchange Online/Forefront Online?
A temporary workaround for this issue would be to whitelist your domain.onmicrosoft.com and domain.com so that your server does spit out an error thinking the mail is being spoofed