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Breaking changes in SmtpClient in .NET 4.0

In .NET 4.0 the SmtpClient class now implements IDisposable. This is a breaking change what you should watch out for.

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Protecting against Regex DOS attacks

Bryan Sullivan describes in the May issue of his MSDN article a denial of service attack that abuses regular expressions. As Bryan explains, a poorly written regex can bring your server to its knees.

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