When a customer orders from the site it generates an order confirmation email, and then a completion email when I have finished the job.

So most of my work is done by sending proofs for the customer to check and confirm.
This is a massive problem as most of my emails are marked as spam and this means the customers are not getting the proof as they just don’t realise they have received it.

Im losing out on lots of business due to this spam issue what can I do?
is my domain marked on a blacklist somewhere?

thanks for any help.
paul.