Help setting up MailGun Verification for my Mailster WordPress Newsletter

General information for the website: Mailster WordPress Newsletter Plugin / MailGun API
Kind of development: Customization of existing website
Num. of web pages/modules: 2
Description of every page/module: https://www.mailgun.com/email-validation
https://mailster.co
Description of requirements/features: Hello,

I need help setting up MaiIGun email validation.

I use a Mailgun SMTP account to send an email newsletter through a WordPress newsletter plugin called Mailster.

Unfortunately my customers email list is very old so it needs verifying before the newsletter is sent. There are only approx 600 emails to verify.

I want help setting up an area where I can verify emails with MailGun and explaining how to use MailGun's vaidation service so I can do it again myself.

Thanks,

David
Extra services needed: Customization
Extra notes: