set in my pdns.conf file for the pipe backend. But in my backend script I have to look for HELO\t1 as that is what is being sent to it. It should send HELO\t2 or whatever the version in the config file is. pipebackend.cc, line 52 has:
thanks, fixed in commit 546
Sweet. SVN server was down when I looked into this (it's back up now) or I would have verified before ticket. Regards.