Proofy

Proofy.io —  bulk email validation service. With proofy you avoid bounces, catch all, dead emails. You increase email deliverability, save your domain email, inhanse open rate.  
Some of our features:  
1) API verification 100K emails per file
2) Hihgt accuracy verification (status — deliverability)
3) Validates MX records on existence for every mail address
4) Domain score  
5) Disposible email 
6) Syntax Verifier
7) Realtime Processing
8) 500 FRee — checks
I suppose the audience is aware of many nuances in email marketing. Each email inbox has a sender reputation associated with our IP address of the sender. If you have a lot of bounces and spam, it affects our reputation as a sender. If this happens, then at best: your mail will not go to your inbox, at worst: email providers will blacklist your IP or domain, and this is not suitable for business.