Sending email from my website with PHP mail() not working

For testing purpose i’m trying to send simple email but it’s not working. it’s showing that mail send but when i open my gmail there is no email received.
admin please help me.
username: epiz_21401933

Did you check the very first topic in the discussion list already?

https://forum.infinityfree.com/discussion/2681/help-i-cannot-send-email-login-to-ftp-connect-to-my-database