Out of the blue we have lately crawl errors -> Google Webmaster tools pointed us on this <-.
Thats not a real problem if it wasn't like following;
Googlebot couldn't crawl this URL because it points to a non-existent page. (404)
In sitemap: no wrong data.(Okay but where do they come from then?)
Linked from shows these?!:
Also shown links starting with: imap / mail, mx1 and also pop.ourdomain.com And some also point to formal and active subdomain of ours.
For me is this totally incomprehensible, there where no changes on the server or whatever last half year. (FYI: Our site is on a CloudVPS virtual server) But even if, why only having 7 errors of the 1500+ urls which are daily crawled.
Because my lack of knowledge for this issue at all, I hope to find a solution by using the .htaccess to solve at least the 404 issue. And to be honest am curious how this even could happen and/or is this a misconfig somewhere on the server.
ps, Sorry if this is in the wrong topic, not sure where to put this question/issue, server or .htaccess.