To create or add company-wide email signatures and disclaimers in Microsoft 365 (formerly Office 365), you can use Exchange Online's mail flow rules or the built-in signature management features available in the Microsoft 365 admin center. Here's how you can do it:

Using Mail Flow Rules to Add Email Signatures & Disclaimers in O365:

Using Aryson Office 365 Admin Manager

Office 365 Admin Manager provides a feature to add signature and disclaimer to Office 365 user accounts. Below are the general steps to add a signature and disclaimer using Aryson Office 365 Admin Manager:

Using Microsoft 365 Admin Center to Create Company Email Signature and Disclaimers

With either method, the email signature and disclaimer you create will be automatically added to outgoing emails for all users in your organization. Make sure to test the signature to ensure it appears correctly in various email clients and devices. Additionally, consider any legal or regulatory requirements when drafting your company-wide email disclaimer.