Well, i search over the forum but i didn't find my response.
I decide to put an htaccess on the sugar directory, because i want to access to my data from my home, but i doesn't want to have some bruteforce on this webpage (sugar login), or i doesn't want to be indexes by google. Sugar is a private application for my company, not public, so internet don't have to see this.

So i write my htaccess (very basically), but when i send a mass mailing, each mail contains différents image link to my sugar url. Under thunderbird, or outlook, when we click on reply to the mail, an htaccess popup. Normal, because some ressource in the mail are directly link to my webserver.
This url are use to made campaigns tracking. I could custumize or add url tracking, but i cannot remove sugar tracker links, and i doesn't want.

So my deal, i want to have htaccess for my security, and i want to open some free access to sugar in order to have the trackers. I try some rewrite rule and condition but it's doesn't work.

Does someone have try something like i explain ? Do you have some solution for my deal ?

sample of my .htaccess
Code:
RewriteRule ^index.php/entryPoint=image(.*) index2.php/entryPoint=image$1
<Files index.php>
<Limit GET POST>
          require user sugar
</Limit>
</Files>
RewriteRule ^index2.php/entryPoint=image(.*) index.php/entryPoint=image$1
So my idea was : i rename twice time the url that i want to pass over the htacces. I'm not sure that an htacces file permit me to do it, i suppose it's real sequential code, so maybe this tricks could pass.

Sorry for my english

Thank for your futur help!