Sorry, it's the Windows client, V24.2

Are those internal or external users, vs the one below that don't have the @

They are external users, as opposed to the other ones shown.  However, no other external users (not shown) have the @ symbol before the envelope.

It means the user is @ "mentioned" in the message... like MarkMoorhead 

it's a fairly new feature of groupwise, not sure if it was 24.x or late 23

Interesting.  I thought that MAY be what it was, but I didn't see that happening in the message body the user forwarded me.  May have missed it though.

Thanks for the info!

https://www.novell.com/documentation/groupwise24/gw_guide_userwin/data/email_sending_mentions.html

Mention flagging in item lists: Since one of the designed purposes for using mentions is to call-out or bring attention to the mentioned recipient, items in your mailbox list where you are mentioned have the @ symbol appended to the item. For information about filtering on these flagged items, see Mention Options.