In both Hotmail and Yahoo! Mail (but not Gmail) there is the option of using a "Blocked sender" list.
In Hotmail: Options Panel / Safe and blocked senders
In Yahoo! Mail: Options Panel / Block addresses
What is a Blocked list? It’s a friendly term for a blacklist.
More than likely you were already aware of this feature but there are more than a few that don’t truly understand how this feature works.
If you add an e-mail address to your blacklist…
Will e-mails received from that address go to your "Trash" folder? No.
Will e-mails received from that address go to your "Spam" folder? No.
What happens is that upon receive the e-mail is deleted and you never see it, period. It will be absolutely nowhere in your e-mail no matter where you look – and that’s the whole point.
Will the person you blacklist ever be aware of this?
No. The mail sent will still be received by the server, but will be deleted instantly upon arrival and never get to your inbox (or anywhere else in your e-mail).
In instant messaging, when you block someone they are aware of it because there are many ways to check someone’s online status via profile pages. When you block someone on IM, that someone just checks your profile page, sees you’re online and knows he’s been blocked at that point.
This isn’t the case with e-mail. When you blacklist someone, that someone can send mails until his fingers fall off and it doesn’t matter because you’ll never receive them. Ever. And there’s no way the person on the blacklist will ever know he’s been blacklisted by you (not unless you tell him).
Gmail doesn’t have this feature?
No. The closest equivalent is to set up a filter. You can enable the filter so that "If a mail is received from [this e-mail address], delete it." The problem is that it goes straight to the "Trash" to where you could still go in there and view it if you wanted to (temptation rises…)
Is blacklisting a spam prevention feature?
No. Spam filters and blacklists are two separate things. You have complete control over your blacklist whereas with spam filters this is controlled by the mail provider itself.
Blacklisting ensures that once you add an address (or several or just block out a whole range), you will absolutely never receive mails from it ever again.

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“…that someone can send mails until his fingers fall off…And there’s no way the person on the blacklist will ever know he’s been blacklisted by you (not unless you tell him).”
What technology did they use to make email blacklisting gender specific?
http://www.encyclopedia.com/doc/1O29-GENERICPRONOUN.html
You also probably object to ” MEN WORKING ” signs and prefer ” PEOPLE WORKING ”
In the future, all road crews, instead of giving the female a sign to hold, should give her a pick and shovel.
Fair is fair. Would you be happy with that?
OK then: While the girls mend the roads the boys can do the washing-up, the cleaning, washing, ironing, food shopping, looking after the kids and changing nappies, food preparation and cooking, budgeting,… But, being male, you’ll not have to cope with menstrual pains or PMT through doing all that lot. – And also doing it no matter how well or ill you feel: Headaches qualify a woman to refuse sex only. Housework is imperative.
Rich – 1.
Sharron – Zip.
Stay tuned for next week’s match
What message will the blacklisted person receive when they email this person? Will it be a delivery failure notification, or will they believe that the person is still receiving email from them?
The blacklisted sender is never notified at any time he or she has been blacklisted. As far as the sender is concerned, you’re still receiving the mail from them.
You don't know what you're talking about. Hotmail's block sender function doesn't work. Never has. Try it, asshole.