Email sender avatar?

Question

Email

Almost all mail services have implemented the display of avatars of the sender of the letter.
I looked at the email headers with avatars and did not find anything that could be a picture or a link to it. How is it implemented?

Answer 1

Magic =)
If you look closely, then not all mailers show avatars of all other mailers (roughly speaking, for example, if mail.ru shows avatars from Yandex, then it’s not a fact that rambler also shows them).
Each mail hosting has a certain http-handle (there is no standard on this topic), which you can come with a mailbox and get its avatar. Usually, pens are closed to the public. Some companies open these pens publicly and mention them in the documentation, some companies open them only upon special request.
Accordingly, the web muzzle of the mail service is engaged in the search and display of avatars. You can get avatars in the mail client only in the same way - go to some http handle (depending on the domain of the incoming letter) and try to pull out the avatar from there. And before that, the developers of such an email client will have to go through all the mail hosting sites for a long and tedious time and ask them for access or a handle address.

Answer 2

I use the Em Client mail program, it pulls up an avatar from the domain as follows:
/favicon.ico
/apple-touch-icon-precomposed.png
/apple-touch-icon.png
then knocks on the root of the site and from there pulls out the information specified in the <link rel="icon" href="..."> and gets the icon from there.
For the rest, follow the link How to put a photo on Yandex, Gmail, Mail.ru