It seems it's not possible to block spam domains using wildcards.

i.e. block *.ru, or *.bar, but instead i need to enter each tedious sub-domain.

This seems like a huge oversight.

Zoho's built in spam catcher is terrible, and often filters legitimate emails, and the manual blocking capabilities seem to be an afterthought.

Is anyone @ Zoho aware of just how sub-standard Spam handling is with Zohomail? Any plans to address it?

either the automated spam filtering needs to be greatly improved, or better manual tools provided.....wildcard domain blocking surely couldn't be that hard.