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How to configure Exclaimer Cloud in a hybrid mail flow environment

Anthony Skilton
  • Updated

Scenario

You have a hybrid mail flow environment with mailboxes both on-premises and in Exchange Online (Microsoft 365). You want to know how best to configure Exclaimer Cloud for this scenario.

Note: If you have centralized mail flow and use server-side signatures, it is recommended that you also see the solution: How to set up Exclaimer Cloud in a hybrid environment using centralized mail transport. 

Resolution

There are different recommendations for client-side and server-side signatures.

Client-side
To apply client-side signatures for users Exchange Online mailboxes, use the Outlook Add-In.
To apply client-side signatures to on-premises mailboxes, use the Exclaimer Cloud Signature Update Agent.
Warning: The Exclaimer Outlook Add-in is only supported for Exchange Online mailboxes.
Server-side
When you have mailboxes both on-premises and in Exchange Online, run the Exchange On-Premises setup, then the Connect to Microsoft 365 setup.
  1. Complete the steps for Connect to Microsoft 365.
    This will allow for any emails routed through Exchange Online to have a signature applied.
  2. Complete the steps for Exchange On-Premises.
    This will allow any emails that remain on-premises or route directly out to the internet from the on-premises server to have a signature applied.