A newbatch of link messages is the same message as Google is sending from March, So does it mean that Google is not giving penalties to the sites.
Dear site owner or webmaster of….
We’ve detected that some of your site’s pages may be using techniques that are outside Google’s Webmaster Guidelines.
Specifically, look for possibly artificial or unnatural links pointing to your site that could be intended to manipulate PageRank. Examples of unnatural linking could include buying links to pass PageRank or participating in link schemes.
We encourage you to make changes to your site so that it meets our quality guidelines. Once you’ve made these changes, please submit your site for reconsideration in Google’s search results.
If you find unnatural links to your site that you are unable to control or remove, please provide the details in your reconsideration request.
If you have any questions about how to resolve this issue, please see our Webmaster Help Forum for support.
Sincerely, Google Search Quality Team
Matt Cutts on his Google Plus pages has clarified that You Can Ignore Link Warnings
If you received a message yesterday about unnatural links to your site, don’t panic. In the past, these messages were sent when we took action on a site as a whole.
Yesterday, we took another step towards more transparency and began sending messages when we distrust some individual links to a site. While it’s possible for this to indicate potential spammy activity by the site, it can also have innocent reasons.
For example, we may take this kind of targeted action to distrust hacked links pointing to an innocent site. The innocent site will get the message as we move towards more transparency, but it’s not necessarily something that you automatically need to worry about.
If we’ve taken more severe action on your site, you’ll likely notice a drop in search traffic, which you can see in the “Search queries” feature Webmaster Tools for example.
As always, if you believe you have been affected by a manual spam action and your site no longer violates the Webmaster Guidelines, go ahead and file a reconsideration request. It’ll take some time for us to process the request, but you will receive a followup message confirming when we’ve processed it.
As a message is the same, the wording is the same, the only thing that changed is that Google now says that we can ignore these messages (Before Google said that we should worry about these messages).
Does this mean that Google changed its policy not to penalize the sites, it seems so because these messages in past have created a lot of confusion where
people even send emails to sue for organic natural links (Is linking from one site to another Legal)
more interesting Directories Now Charging NOT To Link and
Negative SEO was always in the hunt with rising of penguin and these link warnings.
So what’s next, instead of removing bad links, we can see link disavow tool in the coming months from Google as mentioned by Matt Cutts in this conversation. Overall Google is trying to convey a message that these link warnings can be ignored and will not cause any issue to your website.