There are several reputable email database providers for B2B marketing. Here are some of the top providers known for offering high-quality B2B email lists:
Data.com (formerly Jigsaw): Acquired by Salesforce and integrated into Salesforce's ecosystem, Data.com provides access to a large database of B2B contacts.
Hoover's: A D&B Company, Hoover's offers comprehensive data on businesses and key decision-makers, useful for B2B marketing campaigns.
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