It is recommended to enable Datacenter Activation Coordination (DAC) mode for Exchange database availability groups that meet the criteria.
Using Exchange Transport Rules to Add Email Signatures to Messages
Why using transport rules for email signatures and disclaimers may not give you the results you’re hoping for.
Adding New Email Addresses for Multiple Mailbox Users
This article covers the various methods that can be used to manage email addresses for multiple users in Exchange Server and Office 365.
Exchange Best Practices: Mailbox Storage Quotas
Applying storage quotas to Exchange Server mailboxes is a best practice, to avoid capacity, performance, and manageability problems.
Exchange Best Practices: Deploying Multi-Role Servers
When deploying new Exchange servers it is a best practice to deploy multi-role servers.