Can't send mails using Gmail

I have successfully setup cloudflare to my site (http://bit.ly/1A7adyM). Now I'm facing a problem with emails.

I have setup Gmail to send and receive mails through my domain name. But after I integrate cloudflare to my site I can't send mails.

I already created MX records per this article https://support.cloudflare.com/hc/en-us/articles/200168896-How-do-I-add-Google-Apps-MX-mail-records-. But I still can't send mails using my domain

Do you guys have any idea on how to solve this?