How should we act regarding a 404 that came from a 301?

[Canexel]

Hi!

Some time ago we changed our domain from canexel.net to canexel.es. We spent some time "cleaning" the backlinks to the ".net" domain since we had been penalized by penguin.

After some time we went ahead and did a 301 from .net to .es january 15. From that date on we've noticed that webmaster tools has been detecting a really big increase oon 404 detected on our site.

All this 404 come from .net pages that have been cached by google but don't exist anymore. The problem is that the 301 has made google believe that they exist also on our .es site (where of course don't exist either), and 404 have appeared from this non existing pages pinting to other non existing pages.

We want to to eliminate the urls from WMT but we don't know if we should eliminate them both from the .net and .es domains or just from the .net one. We also would like to know if this would penalize our SEO.

Thanks

[Linda-Vassily]

Do you have internal links that use the .net address? That would make Google try to find them...