Setting up a LAMP&MAIL server

1,Get a free SSL-Cert or cheap one
https://www.digitalocean.com/community/tutorials/how-to-set-up-apache-with-a-free-signed-ssl-certificate-on-a-vps
StartSSL™ Comparison Chart
Is it okay to use the FREE SSL Certificate offered by: Instant SSL by comodo? or Is StartCom better? [closed]
You Can get less than $10/year fro cert from namecheap

#cat ssl.crt sub.class1.client.ca.pem > /etc/ssl/certs/dovecot.pem
#mkdir /etc/ssl/private
# openssl rsa -in ssl.key -text > ssl-private.pem
# cat ssl-private.pem > /etc/ssl/private/dovecot.pem
#chmod 644 /etc/ssl/private/dovecot.pem
#chmod 444 /etc/ssl/certs/dovecot.pem

Setting up an SSL secured Webserver with CentOS

2,setting up the mail server
Running a Mail Server
Email with Postfix, Dovecot, and MySQL on Ubuntu

3,It’s OK to use a Selfsigned SSL for mail server
It is definitely worth enabling SMTP TLS if you can, whether or not you pay for a third-party-signed certificate.
If you are concernced about your mail being marked as spam, consider setting up SPF and DKIM.

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