How to Create Mail Account manually by exim?

i have exim and dovecot in my server for mail-server

How could i manually create email account like user@mydomain.com with defined pass ?

i don't want to use any pricing server software like cPanel or ...
is there any free and stable program for create mail account ?
is it better to create manually or use software?

Solution

There are several way to create ثmail accountو one of them is inserting record to database you can find more information in the following link:
https://www.digitalocean.com/community/tutorials/how-to-set-up-a-postfix-e-mail-server-with-dovecot

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