In article , martin
writes

They will see the spam coming from you, not the original sender.
If they also use bouncing, you will get it straight back.

But it will arrive with a message saying that the address was invalid.
Have you never had an envelope rejection reply?
It looks nothing like a valid post; it could not be mistaken for a
normal spam type post.
If you want to see what it looks like, try sending an email to abc at
jandg spot demon dot co circle uk.
--
Jane Ransom in Lancaster.
I won't respond to private emails that are on topic for urg
but if you need to email me for any other reason, put ransoms
at jandg dot demon dot co dot uk where you see