Just saw a net way to identify a Lightning address as being a Lightning Address:
Cointastical@Stacker.News
The "⚡" before the nym helps to differentiate it from being an e-mail addres.
This was shown in a Tweet by Alby, and can be seen from this post here on SN: #15009 https://twitter.com/getAlby/status/1504479168272154624