I have centos 7 and recently installed postfix mail server and dovecot. I have also installed SquirrelMail version [url removed, login to view] for sending and receiving emails. Everything works file without authentication method but without that all emails go to SPAM folder.
Basically I need a help on setting up SMTP AUTH method so that I can send emails using authentication method and it does not go to SPAM folder.
Basically setting up SPF and DKIM. Let me know how much it cost.