Interestingly, things seem to be changing on the fly, as expected. I read that someone asked if links or urls could be underlined. Now, today, my sig line has "mixed" links. Most underlined and 1 not. But it is still valid and it works. <shrug>
Do I need to tag that one? I removed all the tags, except the High Flight and Tequilla links since they have embedded links, in order to have space left in the sig line.
EDIT: Just saw OOZ662 post, clicked on my underlined links and now they are not underlined. Thanks OOZ662.