send user registeration mail in html format I want to send any email of my site in HTML format, I install smtp , mimemail and mailsystem modules, and smpt configured correctly and test it(I check Allow to send e-mails formated as Html), also this is a snapshot of Mailsystem settings
 
,also in Mimemail settings I set E-mail format in FULL HTML format,also I create mimemail-message.tpl.php in theme folder (and cleared cache).

it seems everything is ok,but when a user register in site, email not send in html format and is only plain text.

How can I send any user email (registertion,canceling,approved,suspending ,...) in HTML format?
I recommend using PHPMailer module. 
https://www.drupal.org/project/phpmailer

It is used to send HTML emails with Mime Mail.