After submitting common app

Let’s say that after submitting an application to a particular college, you receive some good news - maybe you won a really big competition. Can you send them an update email, letting them know? Not something local/regional, of course - perhaps national?

Any opinions, guys?

Yes, you can send email updates.

Agreed, with the qualifier that it needs to be a meaningful update.

Out of interest, do you think I’d come off as, well, annoying or attention-seeking?

Refer to your original question. Refer to @skieurope 's answer. Is it meaningful, or just a means to get an AO’s attention? Am trying hard to bite my tongue re post #4.