I have posted some presentations given to different computer user groups on Slideshare, and am now revisiting some of them, and will be posting others too.
The Webmail Security Presentation
This presentation was given to the Broward Personal Computer Association (BPCA), back in 2008, but I think it is still of value.
Webmailsecurity Apr08 from Steve Costello
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Check it out and let me know what you think. Is it still relevant, or does it need updating.