TowerData in its suite of tools offers email validation service which works through MxValid tool to validate addresses.
With it you can remove invalid emails, correct typos or syntax errors, avoid bots and spam traps.
There is a mailbox check feature that checks whether messages to a mailbox will bounce hard or soft, or deliver.
Free Trial/Demo – Available
Paid Version – They cost $1000 for 100,000 email validations.
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