Free Anti Spam Software

Hello ,

e-mail messages with subject like “Re: Sex Video” are posted to my College yahoo groups, from my yahoo ID.Actually I am not sending any such mails.How to prevent unauthorised usage of my e -mail id.I scanned my computer using Anti spyware and spam removal tools.But no threat detected.Is the virus might be affected at the Yahoo server?

Is there any way to secure my e-mail id? I am using yahoo mail.
Is there any settings available in yahoo mail so that my siganature is a must for sending mail?

Please any one send me the Answer
The Option which I was looking for yahoo is similar to SENDER ID in hotmail.

Is there any technology available iwth yahoo mail.Ofcourse Domain Keys is said to be a similar one.But not available iwth the current Yahoo mail.

For details about SENDER ID see the link below
http://www.microsoft.com/mscorp/safety/technologies/senderid/default.mspx

I currently use Yahoo Mail Plus and have some 3gb of mails.
I do not use the yahoo address, my inbox is empty.
I POP 8 external e-mails accounts, and I do not leave the mails on the original server. Yahoo downloads and stock every mail in individual folders (so the whole thing is tight).

I decided to switch to Gmail because Yahoo Mail Plus anti-spam doesn’t work at all (it barely works with yahoo mail’s address, but never on the 8 external POP mail addresses). I get too many spams.

I created a Gmail account and tried it. The anti-spam works on external POP mails.

Now I would like to export/import all the mails from the Yahoo Mail Plus account to Gmail. How can I achieve that?

thanks!
Thank you Mr. Jingles, but no, that’s not the solution. I mentioned on the details above: import ALL mail, not yahoo mails only. All mails includes all POP3 mails from all folders of Yahoo.

I have a client using a @yahoo.co.uk account trying to email his work domain, this is a SBS2003 exhcange server. If the email has an attatchment it, it will not be received. Although if blank or just text it goes through ok. We are using a ZyWall 5 UTM firewall/antispam and Trend Micro Anti-spam. His email address is whitelisted on both.

Thanks in advance.

Mike