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DANE-for-SMTP-how-to.md
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# Table of contents
- [Table of contents](#table-of-contents)
- [Executive Summary](#executive-summary)
- [Introduction](#introduction)
- [What is DANE?](#what-is-dane-)
- [Why use DANE for SMTP?](#why-use-dane-for-smtp-)
* [DANE explained by illustrations](#dane-explained-by-illustrations)
* [Advantages of DANE explained by illustrations](#advantages-of-dane-explained-by-illustrations)
+ [Mail delivery: TLS without DANE](#mail-delivery--tls-without-dane)
+ [Mail delivery: TLS with MITM using evil certificate](#mail-delivery--tls-with-mitm-using-evil-certificate)
+ [Mail delivery: TLS with MITM using evil certificate](#mail-delivery--tls-with-mitm-using-evil-certificate-1)
+ [Mail delivery: TLS with MITM stripping TLS](#mail-delivery--tls-with-mitm-stripping-tls)
+ [Mail delivery: TLS with DANE](#mail-delivery--tls-with-dane)
- [Reliable certificate rollover](#reliable-certificate-rollover)
* [Current + next details](#current---next-details)
@ -27,7 +25,7 @@
+ [DNSSEC validating resolvers](#dnssec-validating-resolvers)
+ [Configure DNSSEC validation in Exim](#configure-dnssec-validation-in-exim)
+ [Configure DANE](#configure-dane)
- [Implementing DANE for SMTP using Halon (inbound & outbound e-mail traffic)](#implementing-dane-for-smtp-using-halon--inbound---outbound-e-mail-traffic-)
- [Implementing DANE for SMTP on Halon (inbound & outbound e-mail traffic)](#implementing-dane-for-smtp-on-halon--inbound---outbound-e-mail-traffic-)
* [Generic configuration](#generic-configuration)
+ [Install or generate key pair](#install-or-generate-key-pair-1)
+ [DNSSEC](#dnssec)
@ -71,7 +69,7 @@ DANE addresses these shortcomings because:
* This allows sending mail servers to unconditionally require STARTTLS with a matching certificate chain. Otherwise, the sending mail server aborts the connection and tries another server or defers the message.
* Receiving servers with published TLSA records, are therefore no longer vulnerable to "STARTTLS stripping".
## DANE explained by illustrations
## Advantages of DANE explained by illustrations
### Mail delivery: TLS without DANE
The illustration below shows two TLS capable e-mail servers without using DANE.
![](dane-example-1-no-dane.png)