I "report spam" on almost all emails formulated along these lines, both for my own sanity and in the hope of reducing the burden for future targets. The senders often don't realise that their emails constitute spam and will send it from their regular addresses at their company domains and probably will later ask their IT teams why their important emails to clients aren't being received.

This advice might work against an executive who is used to wheeling and dealing to get ahead but if your target is developers you might want a more nuanced strategy.