Yes, f5.si can receive emails.
No, f5.si 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
133.130.103.75
MX records
vps40.erinn.biz
150.95.130.236
vps41.erinn.biz
133.130.100.67
vps42.erinn.biz
163.44.171.115