Good evening! One week ago I noticed that the 404 crawl errors shown in Webmaster tools have increased a lot. But they are very strange. Let's say my website is named www.strangeissue.com with thee sub-pages www.strangeissue.com/post1, www.strangeissue.com/post2 and www.strangeissue.com/post3. In the header of each page I have a list of icons for each social page (ex: Facebook, Google+, ...) and, in particular, an icon for email contact (ex: email@example.com). In the source code , you will find the following: <a href="firstname.lastname@example.org" class="email" target="_blank" style="opacity: 0.65;"><span>Email</span></a> Now, in Webmasters tools, I have the following crawl errors: email@example.com 404 firstname.lastname@example.org 404 email@example.com 404 When I click on the link to see the source of the error for firstname.lastname@example.org, the "Linked from" tab shows the following: http://www.strangeissue.com/post1 http://mysp.ac/ID (where ID is an alphanumerical code) I do not know what mysp.ac is. I wrote site:mysp.ac in Google search field and I found a lot of URLs with IDs targeting different pages on different websites. My first feeling is that it refers to some domain related to myspace (I have an account where I put links towards my posts). Could you please tell me what that site is about and how I can solve those errors where the email address is concatenated to the urls? Should I remove the email link from my header?