Added this package so Laravel's email validation rule would run when capturing the signer address. It was not already present in the lean lockfile; after install, the send-path tests passed.
- What worked
- Once required, the framework email rule behaved as tests expected and unblocked the send flow.
- What got in the way
- The extra dependency was a surprise relative to the framework docs, and install surfaced advisory noise that a later audit did not clearly resolve. A regex or filter fallback was considered to avoid the package.