1. Add the TXT to the DNS configuration for maildelivery.pw
TXT record:
google-site-verification=jpJL-EBh-Utzc5akSPZJxi
2. Click Verify
When Google finds the DNS record that you have added, we will verify your ownership of the domain. To stay verified, do not remove the DNS record, even after the verification succeeds. (DNS changes may take some time and if we do not find the record immediately, we will check for it periodically.)
Having trouble? Try Adding a CNAME record as an alternate option.
Note: On successful verification, your account will also have access to the domain’s data on Google Search Console.
Leave the subdomain box empty,
Change the dropdown to TXT
enter google-site-verification=jpJL-EBh-Utzc5akSPZJxi into the value field.
Click Set Record then wait a minute or two. Go back to Postmaster Tools and click the Verify button for your domain. Your domain should then verify with Goofle Postmaster Tools.
You do not need to register for MXToolbox. Simply x out of the registration page and information will be shown. The RATs blacklist should clear up on its own as you have set rDNS. The Barracuda blacklist you will need to request to be unlisted at http://barracudacentral.org/rbl by following the link for Removal Request.