How to create emails on Server?

I created a SMTP server using your video. now i don’t know how can i create multiple emails to send emails from or receive emails to? Please advice…

Are you using Postal?
Postal is MTA only. Which means it doesn’t provide mailbox. You can simply use SMTP information to send email from other software like mailwizz.

For receiving you can forward received emails to another address or use services like Gsuite for receiving.

I am using Postal and i have sendblaster. how can i create emails to send bulk emails from?
and how can i receive replies to those emails?

You can use forwarding feature of Postal to forward replies to another email address. Postal doesn’t support webmail, therefore you wouldn’t have it.