Submitted via IRC for TheMightyBuzzard
Google announced back in February 2016 that it planned to improve Gmail security by adding new security indicators to the service.
One of the improvements was the introduction of a new red question mark icon in place of the profile photo, avatar or blank icon to highlight unauthenticated emails.
Google announced yesterday that the roll out of the feature started, and that Gmail users on the web and on Android will soon notice the new red question mark icon for unauthenticated messages.
[...]
Google's method for determining the authenticity of a message is the following one: if a message can't be authenticated using DKIM or Sender Policy Framework (SPF), it is marked as unauthenticated.
Gmail, on the web, displays profile icons only when an email is selected, but not in the email listing itself. This means that you will have to click on a message to find out if it is authenticated or not.
Source: http://www.ghacks.net/2016/08/11/gmail-question-marks-unauthenticated-senders/
(Score: 0) by Anonymous Coward on Saturday August 13 2016, @02:11AM
First, you should check http://www.dkim.org/deploy/index.html [dkim.org] to make sure your software supports it. If it does, there is usually a step-by-step guide somewhere in the docs or a separate package that has all you need. The way I did it was download a package for my MTA and it had an executable that generated the requisite info, which I used with the man page for what to put where.