Do soft bounces get resent?
No, they're only sent once.
Well, it actually depends on the kind of bounce message. If a server bounces an email back and says 'could not deliver, try again in 1 hr', Campaign Monitor will automatically do that.
That could happen several times over, but if it is not successfully delivered eventually the recipient server says 'can't deliver it' and Campaign Monitor will show it in your reports as a soft bounce.
Thanks for correcting me, mate :)