Intercepting click on send in Mail.app

Is it possible to intercept click on S开发者_StackOverflowend in Mac OS X Mail application?

Thanks

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You can, but it won't necessarily be easy. You should be able to inject some code into the program (see for example SIMBL and F-Script Anywhere) and then change the button's target.

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Basically it can be done by using Accessibility APIs. I listen to moue click events in my application, so when I get a click I check whether the Mail.app is a frontmost application and whether a click came from Send button UIElement.