Do somebody know if i can use Mandrill as mass mailing, or is there somebody who use Mandrill for mass mailings?
Are there other providers that are compatible with civicrm, for mass mailings?
Yes, you definitely can connect CiviCRM to Mandrill for email delivery, including mass emails. Theres also Sparkpost etc. We did a video on the subject if you're interested. https://youtu.be/lQvl4i86Z6Q
I'm using Amazon SES with all my CiviCRM accounts now. (I used Mandrill ages ago before monthly fees made it impossible. The I used sendgrid until that kept getting blocked emails due to shared IP addresses.) Amazon AWS is not the easiest to setup, and I have never figured out log reports, but it's super fast and reliable. You must request to get out of the sandbox after setup, and can only send from addresses in authorized domains. Use this extension: https://github.com/mecachisenros/aws