#remotecontent — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #remotecontent, aggregated by home.social.
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@pascaline : I hope that I understand your issue correctly.
If an email message asks the email program (used by the recipient) to load external content (which usually happens each time the recipient opens it), typically the sender is considered to be impolite.
The reason is that the sender can observe whether, and if so when exactly, someone opens the email. Also, the IP-address of the recipient is revealed to the sender (that is, to the server hosting the external content).
This trick is commonly used by marketing companies and/or spammers.
In addition, albeit not very common, sometimes email programs have vulnerabilities that cause code execution when external malware is loaded that exploits such a vulnerability.
Finally spam filters don't like external content for multiple reasons, such as: it may be a "spammy" image, it may change over time, and it can even be something that looks like an image but actually (also) contains executable code.
OTOH, sending emails with huge attachments is not considered polite either.
Your best bet may be to include a highly compressed (relatively low quality) sample of a huge (in bytes) image, and add a link (to be manually clicked) that allows the recipient to download the full version.