Issue with emails sent to Outlook and DPI scaling issue.


Issue with emails sent to Outlook and DPI scaling issue.

I am using my own code and i would like to know if before sending the email, CC removes anything from the code.

On the advanced editor though I can see everyhing that I have though.


Here is the solution I implemented for the DPI scaling on Outlook:


So the html tag:

<html lang="en" xml:lang="en" xmlns="" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:cctd="">


Code on head:

<!--[if gte mso 9]><xml>


And inline styling on the images.


Does CC removed the any of the above before sending the email? I am thinking that it might removes the xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" from head or the xmlns:cctd="" overwrittes something?


Thanks in advance!




Hello Georgia,


I have been working on this and doing some extensive testing over the past few days. What you are trying to accomplish is not specifically unsupported by Constant Contact, however, there is currently an issue that our engineers are working on that has also impacted your solution to this problem. At present the information that you are including in the header can be used on a custom HTML(not XHTML) email through our advanced editor.


However, the additional attributes that you are including on the <html> tag are not currently able to be sent.


Unfortunately my level of knowledge about this solution to the outlook DPI scaling issue is not enough to know how/if this solution will function without the additional attributes in the html tag. If you have access to a microsoft system with outlook where you can easily test how it performs with adjusted DPI settings, I would suggest creating a few test campaigns to see if this solution is functional.


If you have any questions, please let me know and I will be happy to do what I can to help!



Elijah G.
API Support Engineer

We have this exact same issue.


Are there other ways to have Outlook clients render images correctly using custom code?


How does Constant Contact handle DPI scaling with its own templates?




Hi Barton,


I had to do a bit of research on this, but we've addressed this with our new Third Generation editor that we're slowly rolling out by building our templates, and the images in them, to be responsive an adapt to the size of viewing window. As far as other methods, I am unfortunately not familiar with other methods to force outlook to render images at the desired size when DPI scaling is in effect.


If you have any follow-up questions, please feel free to ask!



Elijah G.
API Support Engineer
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