Unable to send email using the email template

Unable to send email using the email template

Hi,
I was trying the email template and yesterday I was able to send a bunch of mails. I created another follow up email which I tried to send only to me. I have tried sending it twice to me but it never reaches me When I look at the leads section it shows against my name that the mail was sent twice. What is it I am doing wrong?
 
Thanks
 
Pradeep