Yes, cinci.rr.com can receive emails.
No, cinci.rr.com 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
None
MX records
dnvrco-cmedge01.email.rr.com
69.134.155.135
dnvrco-cmedge02.email.rr.com
69.134.155.136