How to make your own bulk email server

This is a step by step guide how to make your own bulk email server over VPS/Own Server. If you follow each step you should be able to send 1 million emails in Inbox everyday.

Step 1 Prerequisites-

System Requirement-

A good VPS provider
A good DNS provider
Minimum 4GB Ram, 2 vCPU and SSD Storage preferrably NVME
OS – Ubuntu 16.04/18.04
A good PHP & MySQL based email sending software (preferrably paid)

Step 2 Make DNS Entries-

A Record
MX Record

Step 3 Installation-

Considering the VPS provider has provided you with root access to Ubuntu 16.04/18.04 server

nano /etc/hostname – set hostname eg mail
nano /etc/hosts -eg. Add Your external IP FQDN mail
hostname mail
Do a hostname -f – should display FQDN
apt-get update
cd /
mkdir downloads
cd downloads/
mkdir virtualmin
cd virtualmin/
wget http://software.virtualmin.com/gpl/scripts/install.sh
/bin/sh install.sh

Step 4 Configure Virtualmin-

Access Virtualmin using https://FQDN:10000
Enter your root ID and password
It will take you to post installation wizard click next
Next every where click on use more ram option and click next until you get to mysql page
on mysql page do not select more ram for postgremysql option
set your mysql password
select hashed option for more security
Enter your name servers from DNS provider and click skip check resolvability
Once post-intsallation wizard is complete click on recheck and refresh configuration
Click on bell icon on the right and install all updates available

Step 5 Configure the server-

On the left hand side click on edit databases and then add a new database
Give name as per your mailing software and enter a password
click on Additional options and select UTF-8 Unicode and UTF-8 General ci
Click on edit users add new user name @domainname.com
Click on permissions and give permission to the newly created database
Go to Virtual Server configuration Click on SSL certificate and then click on last tab lets encrypt
make a custom request rather than defaul for the following mail.domain.com and domain.com
Now click on each option and apply certificate on each element ie postfix,usermin,webmin etc
Close the tab and now open the URL again you should be secured now

Step 6 Setup Elements of postfix:

Go to webmin->Servers-> postfix mail server->SMTP client options and at the end check the text box enable TLS and save- This will configure TLS
Go to email settings and click on DKIM option
Click on sign outgoing email and setup the identifier ie 2005
Click ave this will install the DKIM filter
Come back and it will show the DKIM key put it as a text record with the DNS provider
Make an spf entry v= spf1 mx ~all with your DNS provider
Setup DMARC now by going into webmin->BIND DNS Server-> Bottom Right click your domain Name-> Then click on DMARC and setup your DMARC policy and click ok- DMARC installed pick up the DMARC record and paste it is a TXT record with your domain provider
Send a test email on gmail it should show SPF,DKIM,DMARC pass
Setup reverse DNS on the VPS

Step 6 Warmup your IP-