IPv6 email autoreply facilities again

My IPv6 email autoreply facilities (autoreply@v6-mail.com and www.v6-mail.com) have helped many system administrators to test and troubleshoot their v6 or dual-stack SMTP servers.   I decided that for those successful email transactions via v6 channel, I will pass the maillog to the parties initiating the email tests.   This definitely shall make other people happy and the workload imposed on me is quite minimal.