Yes, maildu.de can receive emails.
No, maildu.de is a throwaway domain and should be blocked.
You can use MailCheck's free API to automatically block throwaway emails. Read our documentation to get started. No registration required.
A record
104.28.16.109
MX records
mxa.mailgun.org
52.25.162.252
mxb.mailgun.org
35.169.255.110