This is a collection of useful tutorials on email security implementation, arranged according to the implementation steps that we recommend for all email service providers. We read and tried them as far as possible, but, as technology evolves over time, feel free to contact us to point out obsolete or incorrect tutorials and to suggest new ones.
1. Join TES
6. Encrypt your email traffic
Postfix TLS support
Dovecot SSL configuration
How to secure a mail server using encryption
Using Let’s Encrypt SSL certs with Dovecot
Postfix and Dovecot on Ubuntu with a Let’s Encrypt SSL certificate
7. Secure your domain names with DNSSEC
DNSSEC with PowerDNS
Inline signing with BIND 9.9.0
How do I add a DS record to my registrar?
Deploying DNSSEC: Validation on recursive caching name server
DNSSEC in the PowerDNS recursor