Advertising spam from @a. addresses

Hello there, for about a month now, I've been getting spam on one of my email accounts which always have "@a." in the address.
The email address is always something like:
<string of random numbers and letters>@a.<Title relating to what is being advertised>.com

I'm getting this on my older email account which I guess I've given to too many random sites.
But has anyone else been receiving these?
Because they're coming from different domains, I can't just block the domain to block them all. I'm getting at least one a day, so they're a bit of a nuisance.

I use Hotmail/Live, is it worth taking this to Live mail to see if they can do something to block these emails?


Finding other people on the internets with this issue isn't easy as Google does not support non-alphanumeric characters.

rathaunique said:

You get a couple a day? Lucky you. I get about a dozen!

I get none... I guess I'm lucky!