Yes, tightmail.com can receive emails.
No, tightmail.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
199.16.11.152
MX records
mx1.vfemail.net
149.210.139.175
mx2.vfemail.net
149.210.139.175
mx3.vfemail.net
149.210.139.175