I've seen blue boxes appear around images, but I've never seen this before. It looks like blue lines above and below my images at the top of my email newsletter that are oddly pixelated. Does anyone know how to fix this? This wasn't happening when I tested the template before!
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Try setting border="0" or style="border-width: 0;" for each image and see if that works.
Is this on Marketo preview or on you email client (e.g. Outlook) ?
If outlook or some other client, I would look into an <a> link on the image or on the buttons and some inline CSS styles that would be missing (typically a text-decoration: none style)
Hi Grégoire Michel, I checked and my links are set to "text-decoration: none".
This is visible in my email client (outlook), but when I've used this template before, it's never added the lines before.
I would probably try to test this on other email clients to see how much of this is specific. If it does not happen elsewhere, it is related to the CSS and the (bad) CSS support of Outlook.
That works for me when this happens!