It makes a lot of sense to improve the performance of email campaigns, but to link poor email reception to Google Search penalties is highly speculative and mis

It makes a lot of sense to improve the performance of email campaigns, but to link poor email reception to Google Search penalties is highly speculative and misguided. The site in question was most likely affected by the Panda update which was released (in several iterations) around the same time and looking at the articles on the site I can see why this could've happened.