I use https://truemail.io/ and would love to see an option to connect to that service.
The TrueMail API is a typical RESTful API so it can’t be too hard: https://developers.truemail.io/
Hi Linus, thanks for the suggestion.
Currently, Oempro is integrated with Cleanify.io and you can enable Cleanify.io integration under Admin Area > Plugins section:
Hi Cem. Thanks for your answer.
I’m already using Truemail and I have a lucrative deal with them so that’s why 
Makes sense
Truemail has been added to our todo list for coming updates. We will do our best to check it out the integration options soon.