We noticed that goods offered in our email newsletters used to disappeared from first google search results page!?

[Patogupirkti]

We noticed that goods offered in our email newsletters used to disappeared from fisrt google search results page. Goods where in top 5 positions or even higher, but after email newsletters we didn't find them even in top 100. We suspect service provider of email sending is in blacklist? Could it be reason? If yes, how could we check that?

[IOSC]

No that should not be an issue...a single privately sent email to customers should not effect your rankings in the google rankings.  Do the due diligence on the provider company that you worked with, use the open site explorer and Webmaster Tools to see if you have new links, if so where did they come.  It sounds like an issue that is not related to the email...but at any rate try to find out why a dropped happened