
Does anyone know why this is? It appears to be completely reandom and not a setting in the Email Client.
I have even tried adding the image as a logo in the Letterhead Email template but that sometimes does the same thing.
Any help from someone would be great. This is driving me crazy.
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I know this is an old post, but if anyone else is looking, this worked for me..
I was also getting the blue box with a aquestionmark on receipt of teh email, even though it showed up ok in the preview in SFDC.
I found that right clicking on the image preview in the document section (rather than viewing the image and then taking that URL) was my issue.. so the URL to use in the HTML should look like this: https://c.na3.content.force.com/servlet/servlet.ImageServer?id=015500000039ZnX&oid=00D5000000072NP&lastMod=1506107497000