Email Serving - Making an Image Responsive
Making responsive email images
To make an image responsive, you need to edit the tag slightly at the end replacing the size with style="max-width:100%;height:auto;" which allows the image to reduce in size but not grow beyond the original size.
Example:
Original Tag
<!-- 728x90 email [email] -->
<a href="https://servedbyadbutler.com/go2/;ID=XXXXXX;size=728x90;setID=357745;uid=[EUID_HERE];click=CLICK_MACRO_PLACEHOLDER" target="_blank"><img src="https://servedbyadbutler.com/adserve/;ID=XXXXXX;size=728x90;setID=357745;type=img;uid=[EUID_HERE];" width="728" height="90"></a>
Edited Tag
<!-- 728x90 email [email] -->
<a href="https://servedbyadbutler.com/go2/;ID=XXXXXX;size=728x90;setID=357745;uid=[EUID_HERE];click=CLICK_MACRO_PLACEHOLDER" target="_blank"><img src="https://servedbyadbutler.com/adserve/;ID=XXXXXX;size=728x90;setID=357745;type=img;uid=[EUID_HERE];" style="max-width:100%;height:auto;"></a>