I don't receive email from my server (mailutils,postfix)

Hello, I have been using your services for 3 days, I am not receiving email from my own server, I have installed postfix and mailtutils. However my friend receives emails from his own server and he has been using digitalocean for 2 months and I use the same commands as him.


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here all commands i put on linux: apt-get update apt-get install apache 2 apt-get install php apt-get install mailutils apt-get install postfix apt-get install unzip sudo apt-get install apache2 php7.0 libapache2-mod-php7.0 a2query -m php7.0 sudo a2enmod php7.0 sudo service apache2 restart