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Título
Unable to forward emails from Office365 using the sub-domain forwarding SMTP address -
Descripción
Unable to forward emails from Office365 using the sub-domain forwarding SMTP address User@Lotus.domain.com
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Causa
The Forwarding SMTP domain used for sending emails from Office365 is Lotus Notes is "lotus.domain.com".
Forwarding SMTP address is part of the Proxy-addresses list of Mailbox, Accepted Domain configured as internal relay.
By design, Office365 will resolve the emails to an AD Object during the Transport pipeline and query the Proxy-address attribute.If the Proxy-address existed and the recipient is a mailbox type then forwarding address will be ignored by O365 Transport server.
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Resolución
Resolution was to remove the forwarding address from Proxy-address field and sync the AD Object back to Office365 using Azure AD connector.
In case of Cloud Mailbox (Not synced) Properties can be edited within O365 administrative tools (Portal\PowerShell)