In Mac Mail on OS 10.5.8 I am receiving bogus emails which claim to be sent by people in my address book, but actually are not.  How does this happen and how can I correct this problem

n Mac Mail on OS 10.5.8 I am receiving bogus emails which claim to be sent by people in my address book, but actually are not.  How does this happen and how can I correct this problem

You said:
I am receiving bogus emails which claim to be sent by people in my address book, but actually are not.
...and:
Are you saying that my address book has not been hacked into?  That others are getting these email addresses from another source?
This confuses me.  Are you saying that you are receiving bogus e-mails from some of your contacts, or are you saying that they are receiving bogus e-mails from you?
If the latter, there are a number of reasons that people might be getting e-mail from you.  Malware, though technically possible, is extremely unlikely.  See Someone is sending messages from my e-mail address!
If the former, that's rather unusual.  The only decent explanation I can think of is that a bunch of your Windows-using contacts got infected with something and their machines are being used to spam everyone in their contact lists, which would include you.

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