If AI generated content is required to have a watermark, will this make you less likely to send it to your customers?

No, it wouldn't make me less likely to send to customers.  But I would only use AI-generated content in specific situations.  Relationship-building, no; routine answers or industry info, yes.

I endorse AI watermark. People need to know. No I will not be less likely to send it. AI generated content has its place. Any repeatable, standard policy, consistent messaging, public factual knowledge can be AI generated and sent to customer so they know they are getting generally  accepted information. However, personal emails, discussion, and insights should be person and genuine.