It seems that GoDaddy's email marketing does not allow us to embed posts from social media. I wanted to include a number of posts from Instagram. I got the embed code and added it to my email campaign, but (despite the post showing up correctly in the email), the program would not accept the embedding. It was not due to any technical error, but rather by "rules" which govern the program.
I manually worked around the problem by uploading the pictures, adding captions, adding links, etc. -- but the process took me at least 20 minutes when it should have taken two minutes at the most.
GoDaddy, when will you update this program to allow embedded posts? It's 2017 and we need this feature!