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If one of your Office 365 mailboxes has been configured with external forwarding you may encounter this error message when trying to send an email: Remote Server returned ‘550 5.7.520 Access denied, Your organization does not allow external forwarding. Please contact your administrator for further assistance. AS(7555)’ 1. Go to Threat Management, select Policy and Anti-Spam (https://protection.office.com/antispam) […]

Issue Shared mailbox emails were not saved in the Shared mailbox Sent Items folder but in the user’s personal Sent Items folder in Outlook.   Solution We can follow one of the three methods to resolve this issue. Modifying the registry key on each computer where the shared mailbox profile is configured. Using Set-MailboxSentItemsConfiguration PowerShell