I am running an hosting company and i was previously affliate of hostgator. when i sent mails from my domain to my customers it would come as info@domain.com via hostgator.com and mailed by hostgator.com
But now i switch to the new host I want to send bulk emails to my optins subscribers of around 452 mails at a click from my other vps and other sitenew@domain.com
What i have done is enable spf and dkim for the domain where the script is installed
i read over here that i need to add entries to allow 3rd party send mails from my server
what i do is have vps with cpanel centos 32bit os in it