I did my layout, the rendering under a browser is good, but when I test in a webmail the images are separated by a white frame
Your message looks like this:
The doctype of the webmail takes precedence over that of the message.
Most webmails are starting to use this one: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
This has the effect of forcing the layout in CSS, which is not always compatible with the message code.
Change the css code of a campaign to solve this incompatibility
On each image of your campaign, integrate this code in each img tag:
<img src="image.jpg" width="100" height="100" alt="mon image">
<img style="display:block" src="image.jpg" width="100" height="100" alt="mon image">
The rendering under webmail is now like this:
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