IT:AD:SMTP:HowTo
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IT:AD:SMTP:HowTo:Connect to Google Mail Servers (and Others)
IT:AD:SMTP:HowTo:Open eml files without Outlook
http://skysigal.xact-solutions.com/Blog/tabid/427/entryid/1853/C-Sending-HTML-Email-with-embedded-images-and-attachments.aspx