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If DHCP Failover is configured in load-balancing mode, make sure both servers see the DHCP request: The load-balancing mechanism is defined in RFC 3074, in which a hash is computed from the MAC address contained in each DHCP client request. A range of hash values (also called the hash bucket) is assigned to each DHCP server based on the load balancing percentages that are configured. Servers determine if they are designated to respond to the client based on their assigned hash bucket.

Exchange Online can have a Forms Library, check the following folder and set permissions for users to manage Get-PublicFolder -Identity "\NON_IPM_SUBTREE\EFORMS REGISTRY\Organizational Forms Library" https://support.microsoft.com/en-us/help/3109076/create-an-organizational-forms-library-in-exchange-online

# Outbound spam MT Log source_context: Protocol Filter Agent recipient_status: LED=550 5.1.8 Access denied, bad outbound sender. # PowerShell Get-BlockedSenderAddress; Remove-BlockedSenderAddress

is this thing on?

Outbound spam source_context: Protocol Filter Agent recipient_status: LED=550 5.1.8 Access denied, bad outbound sender. Get-BlockedSenderAddress; Remove-BlockedSenderAddress