For reference: When mail is being delivered to or from a Salesforce Mail Transfer agent (MTA) using TLS, the transaction is utilizing TLS 1.2 with one of the ciphers suites from the following list.
ECDHE-ECDSA-AES256-GCM-SHA384
ECDHE-RSA-AES256-GCM-SHA384
ECDHE-ECDSA-AES128-GCM-SHA256
ECDHE-RSA-AES128-GCM-SHA256
ECDHE-ECDSA-AES256-SHA384
ECDHE-RSA-AES256-SHA384
ECDHE-ECDSA-AES128-SHA256
ECDHE-RSA-AES128-SHA256
AES256-GCM-SHA384
AES128-GCM-SHA256
AES256-SHA256
AES128-SHA256
AES256-SHA
AES128-SHA
ECDHE-ECDSA-AES256-SHA
ECDHE-RSA-AES256-SHA
ECDHE-ECDSA-AES128-SHA
ECDHE-RSA-AES128-SHA
DHE-RSA-AES256-GCM-SHA384
DHE-RSA-AES128-GCM-SHA256
DHE-RSA-AES256-SHA256
DHE-RSA-AES128-SHA256
DHE-RSA-AES256-SHA
DHE-RSA-AES128-SHA
Use Email Logs to Monitor Emails Sent from Salesforce
Interpret TLS information in Email Log Files
TLS connections for Outbound Email and Email Services
Salesforce Services and Marketing Cloud Supported TLS Cipher Suites
Supported Cipher and TLS versions for Government Cloud Plus
Test Supported Client SSL/TLS ciphers
The 360 Blog - Salesforce to Replace RSA Key Exchanges with TLS 1.3
000383092

We use three kinds of cookies on our websites: required, functional, and advertising. You can choose whether functional and advertising cookies apply. Click on the different cookie categories to find out more about each category and to change the default settings.
Privacy Statement
Required cookies are necessary for basic website functionality. Some examples include: session cookies needed to transmit the website, authentication cookies, and security cookies.
Functional cookies enhance functions, performance, and services on the website. Some examples include: cookies used to analyze site traffic, cookies used for market research, and cookies used to display advertising that is not directed to a particular individual.
Advertising cookies track activity across websites in order to understand a viewer’s interests, and direct them specific marketing. Some examples include: cookies used for remarketing, or interest-based advertising.