Yes, gtmail.com can receive emails.
No, gtmail.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
54.235.212.68
MX records
mail.b-io.co
198.133.159.120
mail.gtmail.com
66.115.170.98