On 2007.12.12 09:33:12 +1100, Tim- tigre11 scribbled 2.2K characters:

Very suspicious extension of attachment

Sender: "Gwern Branwen" <[1]gwern0@gmail.com> Recipient: [2]haskell-cafe@haskell.org Subject: [Haskell-cafe] Software Tools in Haskell

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[3]avast! Antivirus: Outbound message clean.

Virus Database (VPS): 071210-0, 10/12/2007 Tested on: 12/12/2007 9:33:52 AM avast! - copyright (c) 1988-2007 ALWIL Software.

References

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Not very familiar with cryptographic signatures, are you? https://secure.wikimedia.org/wikipedia/en/wiki/Digital_signature -- gwern