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This problem is only happening in Outlook Webclient.com.
I am creating an HTML for an email and some images are not trimming, actually the src attribute is being replaced by a transparent 1x1px Base64 (remembering that only happens in Outlook.com Webclient, other clients like Gmail, Yahoomail or mobile app this problem does not happen), follow the example:
URL of the image: https://images.passeidireto.com/user_picture/73723514/picture/8b5a0ab7-26ac-45b9-9028-a3f5c4a6a05d/picture.large
How I write the images in my email HTML:
<img src="https://images.passeidireto.com/user_picture/73723514/picture/8b5a0ab7-26ac-45b9-9028-a3f5c4a6a05d/picture.large" alt="" width="50" height="50">
How Outlook.com shows this image:
<img data-imagetype="External" src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAEALAAAAAABAAEAAAIBTAA7" originalsrc="https://images.passeidireto.com/user_picture/73723514/picture/8b5a0ab7-26ac-45b9-9028-a3f5c4a6a05d/picture.large" data-connectorsauthtoken="1" data-imageproxyendpoint="/actions/ei" data-imageproxyid="" alt="" width="50" height="50">
Why Outlook.com changes the src of my image to the data:image/gif;base64?
It has to do with the extent of my image?
By default, Outlook blocks all external images. https://support.microsoft.com/en-us/office/block-or-unblock-automatic-picture-downloads-in-email-messages-15e08854-6808-49b1-9a0a-50b81f2d617a?ui=en-us&rs=en-us&ad=us
– Valdeir Psr