Email reach to INBOX , Bulk Email for our own setup

On a day to day base we send out more 50k emails. we looking for someone who can help us to keep our IP without getting spammed or reported. Firewall Update, Server Management, Email security.
Mail Server, Mailbox Setup, Configure SMTP, Send and Receive. Email reach to INBOX. Bulk Email.
So that it can reach the inbox instead of spam folder.