Please help me find a thread (or a similar resource)

皆さん、大変ご無沙汰しております。I remember a year or two ago, there was a thread about writing a letter/email to someone you don't know. This never happens in regular Japanese society (there's always an intermediary), but it does occur sometimes in international communications. I haven't been able to dig up the thread with the search function, so I'm hoping someone here has it bookmarked, or at least knows of a similar resource. Any help would be appreciated.