If you want to send 100k or 1 million or more volumes of emails a day, you can not use regular email marketing providers like mailchimp, sendgrid, mailgun ... in that case you need a dedicated SMTP server. It needs to be taken with own IP and domain so that you can easily relay a large number of emails.
What is an SMTP Server?
SMTP server is a server that allows you to send and receive email with your own domain name. You can create multiple domains or ips on a single smtp mail server to suit your needs. To configure the Smtp email server you need to install the MTA Agent software that you use to relay the email.
MTA Software:
Gmail
Send mail
Exim
Notation
Powermta
e.t.c ...
How to send email using smtp server
You need to make sure that your smtp hosting server is configured correctly, then you need to set up a smtp user account on your server with a secure password. Then install the email marketing software on the server, such as mailwiz, interspire, etc ... Set up your smtp username and pwd in your software and send the campaign.
Tips to improve your salvation
Properly set up spf, dkim, rDNS, dmarc.
Do not try to spoof
Do not send spam words in your subjects like exams, sales, offers, discounts, coupon mark etc.
Do not send spam words to your email message.
Avoid sending bad links or blacklisted domain links in your email.
Avoid sending attachments (most email servers block attachments)
Avoid sending large images or large links in emails.
Include unsubscribed links in the footer or title of your email.
Do not send high volume emails with cold domains and cold ips.
Always follow the CAN-SPAM rule when you send email on the cold list.
Advantages of SMTP Server
If you send an email using your own smtp server, then you do not have to pay the delivery cost for an email to your ESP. You only pay a monthly server fee to your cheapest smtp service provider and that's it. So the main advantage is that it is a cost-effective solution. Also you will send emails with your own domain and IPS so that the receivers will recognize you and you will have a branded solution for your email delivery. If you can get setup feedback loops, you will make all the complaints directly yourself, which will help you keep track of your campaigns and distribution reputation.
If you want to send large emails of promotions or transactions, you need to set up your own smtp server with multiple ips and your own domain. This will help you to save money and send high volume emails at no extra cost.