The answers will greatly depend on how your sales team imports contacts, and likely they do this in many ways.
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they might import their entire list of personal contacts for tracking
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they might import new contacts to an existing opportunity or account
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they might import a list of cold contacts they purchased on their own
On the personal relationship side, sending emails like this is quite aggressive. On the cold list side, sending emails like this can result in high bounce rates and hurt your overall deliverability.
The best thing would be to learn how/why your sales team imports contacts and set up campaigns they can use in each case:
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Cold list warmup campaign
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Personal relationship campaign
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Existing account contacts campaign
These can be requested via Sales Insight, or, if you don't use Sales Insight, you might set up SFDC Campaigns that will then run the correct Smart Campaign within Marketo.