Go to General Settings below your icon on top left, And check if email email_from and reply_to is related to your domain. Like [email protected] also make sure you have checked your SPAM folder also if email arrived there on other case send me your logins i will test.
Your Login system installation logins so i can test if script is sending Emails or not.
System sends various Emails, if you are talking about Email function which process emails you can find that function inside includes/ functions.php , And if you are talking about changing messages or texts you have to edit the pages which sends the messages/emails.
You can find in >> Classes/Users.php most of these emails. They process there during the procedure
