Email are not getting delievered to account.

hello,

I have created a mail server. I have installed Dovecot & configured it at some extent. I have installed Postfix & configured it to use mysql for email users & password. I have installed squirrelMail to send receive email.(Webmail) I am able to login on squirrelMail, & able to send emails to other email addresses. From other email address I am able to send email to to users who are setup in email server. But those are not getting delivered to their email account properly. I believe something needs to be configured in dovecot that I am missing. Please assist me.

https://workaround.org/ispmail/lenny/make-postifx-send-mails-to-dovecot

I am not able to do add this in master.cf, its generating count error, So I need assistance further.

dovecot unix - n n - - pipe flags=DRhu user=vmail:vmail argv=/usr/lib/dovecot/deliver -d ${recipient}

Regards, Ram