White list domain in Gmail

Hi, When we send our newsletters, our domain is mistakenly marked as spam in Gmail. We want some help in white listing our domain so mail from our servers reaches the users inbox. Lets say my domain name is [login to view URL] - If I use this domain in some emailers, gmail puts the first few mails in inbox and rest in spam. I want to identify a way, wherein Gmail can whitelist my domain and put them to inbox always