NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
Cakemail - Email marketing and transactional emails that deliver. Try it for FREE!
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
Hatchbuck - SMB sales and marketing software
DeBounce - Email Validation, Email Checker, Data Enrichment and Appending Tool. Using DeBounce remove invalid, disposable, spam-trap, syntax and deactivated emails.
Salesfusion - Salesfusion provides an easy to use marketing automation platform that allows sales and marketing teams to be successful.