[Wired1]

Probably, but it's a good thing to have both available. When looking at the logs, you can see where spammers attempt various login combos, and which ones get rejected vs. accepted.

Example: They're attempting to create a login by using a specific IP / username combo, but they keep changing the email address. 3 out of 30 email addresses aren't blocked, and all attempted within a 5 minute period. It's a safe bet those 3 are spammer accounts, and you can report them to the list.