Linux command to test mail() function:

echo "test email body." | mail -s "test email subject" user@domain.com

Instructions:

1. replace “test email body” with the body copy of your test email
2. replace “test email subject” with the subject line for your test email
3. replace user@domain.com with the email address to send the test to
4. optionally includ -c to CC another email address
5. optionally include -b to BCC another email address
6. For a longer email body message start with mail(), return, and Control+D as the escape sequence when finished