It stuck at 99% and not able to fully completed the scanning. I tried stopping it and saving it before continuing. It will go back to 95-97% and scan again and still stuck at 99%. 12840/12852. only left a few but taking hours and hours and still cannot complete!
Next I uploaded a new list, 272/15,674 and at the bottom screen it read verifying list... and just stay there.... i have left it to run over night.
The only difference between the last versions is the DNS server list, now we use OpenDNS servers rather than Google's. The rest of the application is identical. Do you have an anti-virus that could disturb the eMail Verifier verifying process?
I removed all background programs on my mac, clean up the list by removing all other field and left on the email addresses. Let it run overnight on my mac. Look at the time of the screenshot was at 9:21am and the time of the console details was at 3:51am. It stopped for many hours and the valid emails were at 583 and till 3:51am was still at 583.
I only work on the current 3.7.7 or higher. If you can't use 3.7.7 (because I guess you don't want to get an update plan) then try to downgrade. Most previous versions are available here: https://www.maxprog.com/support/support-old-versions.php I have absolutely no other report like yours about 3.7.7 giving the issue you are reporting. The only difference between 3.7.6 and 3.7.7 is the default DNS server list.