A "legal communication" is certainly something we would have to carefully define as a group, but as a starting point, I would define it as any communication by an individual or entity that asserts a problem connected to the ownership or use of a domain name by the beneficial registrant based on and citing the laws of any jurisdiction. The communication need not threaten a lawsuit, or be made by a law firm to constitute a "legal communication."  The communication would be submitted via the accepted, to-be-determined means of communication. 

From: Volker Greimann [vgreimann@key-systems.net]
Sent: Monday, August 18, 2014 10:08 AM
To: Valeriya Sherman; Williams, Todd; gnso-ppsai-pdp-wg@icann.org
Subject: Re: [Gnso-ppsai-pdp-wg] Proposal contactability

Hi Valeriya,

Another narrower approach would be to ensure that all communications that contain legal complaints are relayed without exception. To be clear, under this approach, there would be no content evaluation, other than to determine that any given communication is or contains a legal complaint.

What is a legal communication though? Does it have to include a threat of a law suit? Does it have to include formal legal representation by a law firm?
Also, this should be limited to the means of communication offered by the service provider, i.e. if postal relay is not offered, legal communications by postal mail would face the same fate as spam, i.e. the bin...

Best,

volker