On 11/26/18, Wilfred van Velzen pondered and said...
 
 Wv> On the path you showed, there is a fastecho system on a Zone border,
 Wv> which has hardcoded seen-by stripping. That's been known for ages, and
 Wv> nothing to worry about. Dupe detection takes care of it most of the time.
 Wv> 

Hi all. After a netmail from Nick I've opted to read the thread and join the
discussion. I am running Fastecho at 3:770/1 and have been for many years. In
my netmail to Nick I picked up a small entry in the docs

[snip]

        When your system acts  as outbound zonegate you  may need to  strip
    all the SEEN-BY information present  in your echomail for all  messages
    addressed out-of-zone.  FastEcho  is  capable  to  do  that  simply  by
    enabling this feature (which is disabled by default). This can be  done
    by using the flag ZONEGATE  in FEOPT. In any  case FastEcho acts as  an
    inbound-zone-gate,  which  means   SEEN-BYs  will   be  stripped   when
    processing EchoMail coming from another zone.

[snip]

So my system may well be the culprit? But it was certainly not intentional
nor to my knowledge has even been an issue prior. I'm happy to work with
folks to try and resolve the problem. 

Best, Paul

--- Mystic BBS v1.12 A39 2018/04/21 (Windows/32)