The email validation results are often incorrect. The support is poor or non-existent. I had bought a large package because I needed a lot of validations, but I prefer to pay for emaillistverify.com because the results are much better and the API doesn't fail all the time. Here is a list of outages from today that I am monitoring. app.emaillistvalidation.com is by far in last place of all website monitoring:

Nuremberg
11 Oct, 18:14 View Details
HTTP/1.1 408 Request Timeout

Nuremberg
11 Oct, 17:55 View Details
HTTP/1.1 408 Request Timeout

Nuremberg
11 Oct, 17:35 View Details 0.23 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 17:16 View Details 0.23 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 16:57 View Details 0.24 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 16:37 View Details 0.23 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 16:17 View Details 0.29 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 15:58 View Details 0.52 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 15:38 View Details 0.23 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 15:19 View Details 0.48 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 15:00 View Details 0.82 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 14:41 View Details 0.23 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 14:21 View Details 0.47 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 14:01 View Details 0.48 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 13:40 View Details 1.11 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 13:19 View Details 0.23 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 12:56 View Details 0.21 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 12:36 View Details 0.22 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 12:16 View Details 0.22 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 11:57 View Details 0.22 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 11:37 View Details 0.25 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 11:16 View Details 0.22 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 10:56 View Details 0.23 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 10:36 View Details 0.22 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 10:16 View Details 0.52 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 09:56 View Details 0.23 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 09:36 View Details 0.23 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 09:17 View Details 0.22 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 08:57 View Details 0.23 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 08:36 View Details 0.21 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 08:17 View Details 0.22 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 07:57 View Details 0.24 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 07:37 View Details 0.23 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 07:17 View Details 0.23 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 06:57 View Details 0.24 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 06:38 View Details 0.23 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 06:18 View Details 0.23 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 05:59 View Details 0.23 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 05:40 View Details 0.23 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 05:20 View Details 0.23 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 04:59 View Details 0.23 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 04:39 View Details 0.24 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 04:20 View Details 0.23 sec
HTTP/1.1 500 Internal Server Error

Nuremberg
11 Oct, 03:59 View Details 0.22 sec
HTTP/1.1 500 Internal Server Error