All email accounts have "filters" and all you need to do to activate them is click on the "new filter" button.

I think the best email site for this is gmail, but yahoo, hotmail., etc., all have similar features.

Create a filter which includes the offending word -- longer, penis, cock, stronger, etc., -- usually a separate filter for each. Make the "sender" wide open. You can also mark as "safe" anyone trusted in your address book.

Far as having a full spam box, mine right now has something like 156 in since Oct. 9, and, yes, I periodically scan the spam box to see if anyone (trusted) has landed there, and I double check those to make sure they are legit or not, and if not, I let the sender know his account may have been spoofed or hijcacked.

Hoping that helps.