This domain identifies the servers that PricklyMails uses to check whether an email address can receive mail, on behalf of its users.
The check opens a connection to the receiving mail server, asks whether the mailbox exists, and disconnects before any message is sent, so no email is ever delivered from this domain.
Connections to each receiving server are rate-limited.
To report a problem, or to ask that we stop checking addresses at your domain, write to hugodeltour.pro@gmail.com.