Hi @CecileMJ
From experience I would not embed CSAT into the signature.
Delivery of surveys contained in email are highly unreliable across many email clients. The better approach would be make a image CTA and include it in your email (that is linked to the CSAT survey you have built. )
Step 1: Create CTA
Step 2: Link it with CSAT form
Step 3: Include in email
If I helped you please help the community by marking it solved.
Cheers,
Stjepan