Email server configuration for newslatter

Hi. I’m going to send an academic post to all of my contact list by email. for that purpose i install centos 6.5 on my server with postfix and dovecote and phplist according to tecmint site guid. in order to prevent the emails and ip address of server to be spamed i config the server to send emails each 3 seconds.
are these configs enough sothat all of my emails received by contacts and not to be spamed.
i would appritiate any help