I am running a webserver with a VPS host. Now I plan to send out some automatic emails to various users from this webserver and users will be sending back emails to my website. So I installed postfix SMTP application for sending out emails, and I am planning to use gmail to receive the emails. For now there will be only two email accounts for this website, say email@example.com and firstname.lastname@example.org. Is this arrangement OK. What do I need to tell my webhosting company to change, to accommodate this arrangement. MX record only? Please let me know.