Autoconfig prevent my website redirection to https - apache

Question

I have a website in an apache server and a mail server in the same machine. I want the port 80 request redirecting to https 443 port, so I put it in the vhost configuration.
I also want an autoconfig (Mozilla thunderbird use) for my mailserver. However I need to put a config-v1.1.xml accessible on port 80.
The problem is when I request http://example.com it's does not redirect to https://example.com like I want to but it redirects to the autoconfig.
Is there a way to keep autoconfig and have a redirection to https://example.com ?
I have setup a dns record for autoconfig.example.com and call it in vhost file but when I type mysite.com, it still goes in the autoconfig.
Any clues ?
Thanks
Here is the autoconfig.conf
Listen 80
Listen 443
<VirtualHost 178.33.235.19:80>
ServerName autoconfig.example.com
DocumentRoot /var/www/html/autoconfig/
<Directory /var/www/html/autoconfig>
Order allow,deny
allow from all
</Directory>
</VirtualHost>
And the site vhost example.conf
<VirtualHost *:80>
ServerName example.com
ServerAlias www.example.com
RewriteRule ^(.*)$ https://%{HTTP_HOST}/$1 [R=301,L]
</VirtualHost>
<VirtualHost _default_:443>
ServerAdmin admin#example.com
DocumentRoot /var/www/html/example/
DirectoryIndex index.php
ServerName example.com
ServerAlias www.example.com
#SSL Config
SSLCipherSuite RC4-SHA:AES128-SHA:HIGH:!aNULL:!MD5
SSLHonorCipherOrder on
SSLCertificateFile /etc/httpd/ssl/STAR_example_com.crt
SSLCertificateKeyFile /etc/httpd/ssl/STAR_example_com.key
SSLCertificateChainFile /etc/httpd/ssl/COMODORSADomainValidationSecureServerCA.crt
<Directory /var/www/html/>
Options FollowSymLinks Indexes MultiViews
AllowOverride All
LogLevel crit
Require all granted
</Directory>
ErrorLog /var/log/apache/example-error_log
CustomLog /var/log/apache/example-access_log common
</VirtualHost>