Newbie Here, My goal is to setup email accounts with my domain (ex: john@mydomain.com) and use the SMTP Server I configured in my NodeJS App to send mails to my app's subscribers. I followed this tutorial in setting up Postfix and Mailx: https://www.digitalocean.com/community/articles/how-to-install-postfix-on-centos-6 and installed iRedMail following this tutorial: https://www.digitalocean.com/community/articles/how-to-install-iredmail-on-centos-6-3-x64 All is working fine except that all mails from the email accounts are being sent to the spam folder. I have set up a TXT Record with these values as instructed in the tutorial: Name: @ Text: v=spf1 ip4:MYSERVERIP_ADDRESS -all