This probably has a very simple solution.

My outgoing emails (using Mail) seem to me to show an icon of piano keys on the right-hand side, at the top, of each one. This has been picked up from my User account.

I only chose piano keys from the icons supplied, because it was the least-silly one. I would rather have no User-icon at all.

How to get rid of it (piano keys icon showing on all my outbound emails)? I've looked at Mail preferences but cannot see anything there. I've checked User preferences but cannot see any way to disable icon.

It's not urgent, just another minor irritation.

Thanks.