
I run a newsletter service, where people subscribe to it, to receive our weekly newsletter. I use this app just to double-check that all emails are valid and deliverable.
And I must say their support is WOW fast. Max 30 minutes. and you're problem is solved. Review collected by and hosted on G2.com.
The filters are not so accurate: some emails that were classified as bad and undeliverable by this tool were successfully sent to the recipient, but it's a small number. Review collected by and hosted on G2.com.




