asp.net - Embedding Images into Email - What is the difference between ContentID and ContentLocation? -

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i using aspnetemail send emails embedded images , trying choose between 2 options:

contentlocation: embed images using content-location header.
contentid: embed images using content-id header.

i checked aspnetemail website documentation there wasn't information. suspect these options applicable embedding images in email applications?

what difference between 2 settings, , how affect emails?

contentid

represents identifier contents of attachment. contentid can set string value. applications can use contentid implement own identification mechanisms.

contentlocation

contains uniform resource identifier (uri) corresponds location of content of attachment.


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