Hi @SatheeskannaK , Sorry, I should have been more specific. I can add it as a personalised field but I want to add it as part of a 1x1 pixel so inside the html. It shouldn't be passed in a way that's visible to the user. I don't think that's possible using the personalisation option.  

HiI would like to pass Delivery ID through the email delivery itself (within the html body). When using ESPs in the past, I have used ampscript but I'm not sure what to reference to make it happen.  Any help would be great Thanks