Bulk Email Blast for 300k Emails + Basic Email Design Required - repost

We are looking for someone to assist us with a one-off email shot to a mailing list of 300.000 addresses. We will require you to create the email (we will supply all text), which will only need to be a very basic template job to help market our casino product. Once created, we require it to be sent reliably to the aforementioned list. It would be preferable if you had some good feedback in regards to email marketing and especially delivery rates. No point getting 295950 emails stuck in spam folders. The email list we use is opt-in and not spam by the way, hence it would be nice if the emails we send there actually arrived. Looking to have this done within the next week or two. The earlier the better.