Do not display attachments in message:
This setting will disable previews of attachments inside the message. The attachments will still be available in the header.
View all messages in plain text:
When enabled HTML e-mails will be presented in plain text.
Do not include name when copying email addresses:
By default Mail will include name when copying an email address, e.g. "Forename Lastname <name@exampledomain.com>".
Console logging:
Mail can be set to log events to the Console which later can be presented by Cocktail in the Files - Logs section.
The following events can be logged: