I am using hubuco since last 2 months but still bounce rate is there. Please suggest vendor which is good for accuracy.
reduce bounce back
clean up email list
As per your concern, you need best vendors in accuracy level. So I suggest you to choose Zerobounce and Xverify. They also offer accuracy level as well as best features.
Try Zerobounce, they have 98% plus accuracy(as they claim) but on an average you can count that they will remove around 85% of hard bounce mails.