I don't know where to ask this question ? I know it is in wrong section. I am building a list from facebook followers and sending email. They like my email content. first day I got 30% reply. But nest day my all mails goes in spam folder. I am sending mail using php mail() function. I fill email content, it take in variable and get email list from database send them one by one. all mails are send in less then one minute. there is anything wrong in my process. Thanks //Edited one thing more I am sending HTML email.