[exim] Avatar [Probably OT]

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Lähettäjä: nb
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Vastaanottaja: exim-users
Aihe: [exim] Avatar [Probably OT]
Hi,

I have seen that many of you send mails with picture (avatar) that is displayed when I receive it.
Not in all clients, I see this on rainless webmail.
I would like to understand how it works. If someone has a link...
I'm not sure it is exim related. Sorry if it's really OT

Regards

nb