It's better to send it out to all of the tech people subscribed to the list even if it doesn't affect them. Most big companies do this. They have an IT support email list which goes out to all IT staff and anyone who subscribes. If the email doesn't affect them, they simply delete it but it at least means everyone is kept informed of any general problems.
If the tech-mailing list isn't going to be used for things like this, what's the point having it?
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