I need email help associated with my business website

Job ID: 36884809

Budget: $15 – $25 USD

I am having trouble sending emails from my business email attached to my website domain. Gmail is telling me I have do things to this effect, for example: Set up valid reverse DNS records of your IP addresses that point to your domain.
Set up SPF and DKIM so they’re aligned.
Use the same domain for sending email and for hosting your public website. Set up SPF and DKIM for this domain. We also have an email address associated with the website that we can't access. We are so confused. Please help.
Related categories: PHP System Admin Linux DNS Web Hosting