Canadian Pharmacy Bot in Yahoo Mail

I've read where the Canadian Pharmacy spam is actually a bot.
What steps can I take to stop my email from accepting this spam
or do I just continue to delete it ??

I always use "private browsing" mode and delete all cookies when I come off the net. I wasn't sure if Yahoo could do anything about the spam being delivered by the bots.

Sorry for not saying I followed your advice and downloaded SAS. Will run it shortly.

Must be old age.....I know I wrote a response after SAS ran but, It's not listed.
I ran SAS and it found nothing...no unwanted program or file.
Thanks for your explaination.

There is little you can do directly. Once you enter a spam list somehow, it's impossible to get out of it and anyone with access to that will be free to send as many emails as they please. Once you receive it, just delete as soon as possible, opening it might be dangerous too (if not directly, it may provide feedback to the spammer). Other than marking it as spam in your email client, just delete and forget about it, that's all you can do.

Antiviruses, as suggested, are of little value. For one they don't prevent spam at all (since it's sent from another system). What they are "good" for is to scan already delivered spam for some malicious payload, just in case you run it in accident. They might also be useful to clean your system if a bot was installed in your own computer, that prevents you from sending spam yourself without knowing, but don't stops others from spamming you.

Cookies have nothing to do at all with spam. They're just small pieces of text dropped on your browser by websites, frequently used to save site preferences, keep you logged into some site, or at worst to identify and track you. Some can be used maliciously, granted, but again, they're completely unrelated, and having or deleting them won't give more or less spam.

All spam is sent by bots, there is little to no human interaction there. Once your address enters some spammer database by any means, you're toast , plain and simple. He'll spam you as long as he wants to. The only "protection" is the anti-spam filter present in some clients and webmail servers, that'll identify and send it, hopefully, to junk. They have their drawbacks too.

Ultimately, you'll have to accept that spam is an inevitable part of internet. You can filter it, but more will come. Just be careful where and who has access to your email address and with some luck you won't enter a spam list. If the situation becomes unmanageable, the only way out of the mess it to close the email account and open another new one.

Lady Fitzgerald said:

I disagree. While are harmless in themselves, they can be used to collect data, track your activity, and allow spam to be placed on your computer. The reason I had the OP scan with SAS is SAS will detect those tracking cookies and remove them. I have stopped a lot of spam that way. Anytime I start getting multiple attacks for a particular kind of spam, such as the Canadian Pharmacy crap, I run SAS and I will usually find a tracking cookie or two. Removing them and making sure I block those particular cookies usually stops that spam.

Collect data and track you, yes, certainly, but "allow spam to be placed on your computer" makes no sense at all. Email (spam or not) is sent though protocols completely different than the web and cookies, SMTP to be more precise, and it has no knowledge to what cookies are. Cookies are part of the HTTP standard and stored within your own browser, to which no spam server has access.

Antiviruses may cry about cookies because they can be used to violate your privacy, that's a good and reasonable thing to do, but has nothing to do with spam. The only prevention is to avoid your addresss to be collected by a spammer (that's typically done though shady site signups, sold by some other site or from stolen databases). Cookies do not participate in that at all.