Step 1: New Emails Signature Block
Create a New Signature Block, which applies to "New emails only"Step 2: Replies Only Signature Block
Create a New Signature Block, which applies to "Replies Only"Step 3: Create a New Signature Configuration
Select Signature Blocks to add your New and Reply only blocks.Link the Signature Blocks created in Step 1 and Step 2 by dragging the blocks from the right-hand side to the email on the left.