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Is there any way to run a script whenever the user tries to send mail? I'm particularly interested in ensuring that outbound mail doesn't have a blank subject line.

Solutions that involve plug-ins are welcome!

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up vote 1 down vote accepted

It looks like there's no easy way to do this via AppleScript, however there's a plugin that warns in case of blank subject, it's Subjectivity. It works only with Tiger, since Leopard and Snow Leopard's warns you if you leave subject blank.

I found this blog post on writing Mail plugins, however I didn't try to write one.

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It works. And the source is nice, easy to read Python code, which I think I can use for other kinds of scripting. – Charles Stewart May 31 '10 at 8:54

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