email - Can inline images be referenced from a different message in a thread? -


my research through rfc says can reference inline content other mail parts using cid: token. know can use mid: token in similar message-id. when referencing message-id, can reference mail parts of message doing mid:messageid/contentid, contentid being valid contentid in target message.

i'm leaning towards no, inline images (or other inline content) can't referenced , displayed in entirely different messages. if that's true, can't piece purpose of using mid: is.

a simple visualization of i'm imagining this:

given multipart message html body , inline image... our cid reference like:

<img src="cid:abcd-i-am-a-content-id">

this assumes in fact have multipart/related mail part has valid image payload matching content-id.

what if replying original message, can like:

<img src="mid:original-message-id/abcd-i-am-a-content-id"> inline resource presumably accessible client's mail store belongs recipient assuming other normal threading rules followed?

no, there's no way , expect work.

even "mid:" won't work in clients.


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