Mail Reputation/Forwarding to Gmail Expert

I have an issue with what seems like some emails being blocked by Gmail. I have or am in the process of setting up a number of domain emails with forwarding to my gmail address and am testing contact forms from the websites and the email address. Some are not being recieved in gmail and i recieved an email from gmail saying it has been blocked and possibly sue to ip address reputation etc. I need someobe very experienced on this subject to look into it further and find out why these are being blocked and how to fix it. I need a solution where i can easily view all the domain emails in one email address so its quick and easy, i dont want to ahve to check 10+ inboxes regularly, Also i had moved the sites to a VPS to avoid spam filter on shared hosting, however this has not seemed to really help with the issue. Only interested to hire someone who knows all about this and has worked on many cases, not interested in discussing with anyone who is still learning or new to the matter so dont waste your time bidding unless you know exactly what you are doing.