The step here Getting Started Guide - CentminMod.com LEMP Nginx web stack for CentOS looks like it is not working fine, I created a new file .frowarad and add this line Delivered-To: yourusername+linode1@gmail.com but it is not working -- is it related ot any server restrictions from my side, I had a firewall on google cloudm I think I might need to open the smtp port but is there anyway to send using API "like sendgrid API?"
who is your web host ? Vultr blocks server emails until you contact them via support and provide id verification and then they enable emails on your account and any other future created vultr vpses but for Google cloud yes your firewall might be blocking the outbound ports like 25, 465, 587 etc. See a list at https://community.centminmod.com/th...stack-csf-firewall-default-port-listing.5670/