Mac Mail sending out multiple e-mails

Dear All,
My friend reports that today he is receiving 3 copies of every e-mail message that I send him. I'm working on a Mac Pro, Lion 10.7.5, using Mac Mail through Yahoo, and I have only one account. I have an iPod touch, but I have never sent e-mail through that device nor signed up for it on the iPod -- I only use my Mac desktop for sending and receiving e-mails. Anyone else having this recent problem? I never had it before today! Thanks.

Are you sure it's the Mac sending out the spam, or just spam masquerading as coming from your email account (the From: line is ridiculously simple to forge)?
While it's clearly possible to devise a system to cause a Mac to send out spam email (or any other computer for that matter), it wouldn't be terribly efficient for the spammer. Even when they take over zombie machines (and unpatched Windows XP systems are the favorites there) the spammer would prefer to use the machine to send out all kinds of email *AND* would attempt not to draw attention to the actual machine sending out the stuff.
That is, where it *appears* to be coming from will generally not be where it is coming from.
What malware prefers to do is "harvest" an address book from a user's computer (or, more often these days, from an online address book after phishing the credentials from the user) and then using that to send out emails to your contacts that look like they come from you so that they are more likely to be opened. If that's what has happened, there's nothing you could do to the Mac at this point to get that data back.
Again, while it is clearly possible to harvest that data under either OSX or Windows 7 from your address book in either platform, it is considerably more difficult to do that than to go after your credentials for an online site using a phishing attack and then make use of the contact information.

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http://support.apple.com/kb/TS3276
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I am running Os X Lion with Home and student office for Mac. My MS Outlook Mail programme has picked up a virus I think. The programme is sending out multiple mails to addresses that I have no knowledge of.

Hi all: Wonder if any one can advise.
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I have installed and run (I think correctly), ClamXav but it is still happenning.
How can I rectify / rid my Mac / mail programme of this problem?
Regards
PS

Paul111 wrote:
A couple of days ago I noticed 14 emails in my inbox and others in Spam and Junk with a header explaining that these mails are undeliverable; they are mail addressees that I have never heard of.
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PING {hidden}.org.nz (202.6.116.6): 56 data bytes
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64 bytes from NNN.NNN.NNN.NNN: icmp_seq=1 ttl=52 time=167.807 ms
64 bytes from NNN.NNN.NNN.NNN: icmp_seq=2 ttl=52 time=167.624 ms
64 bytes from NNN.NNN.NNN.NNN: icmp_seq=3 ttl=52 time=167.954 ms
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somegirl wrote:
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