>>>Hello all,
>>>
>>>I know I can add CSS directly into an HTML page.
>>>
>>>I have to send emails and I would like to make them prettier.
>>>
>>>How do I add images directly in my HTML + CSS?
>>>
>>>Regards
>>
>>Check:
>>
>>https://mailtrap.io/blog/embedding-images-in-html-email-have-the-rules-changed/
>
>Nice page. Except it does not list the main reason to block external pictures.
>External pictures are used to trace, in special by spammers. One just give the linked file a name distinct to to receiver and will see if the email is read. This validates the mail for spamers. Else it's use by any data-gatherer.
>So sane people will never load external stuff linked in an email.
>(Or use something like Mailtrap that analyses incoming mail for own purpose)
>
>Just my 0,02€cent

Yes.. external images represent a privacy issue.
Base64 embedded images should not have problem.