The mailing list for listmasters using Sympa

["j2" <address@concealed>]

When I try to mail address@concealed I get the below message. But the
first owner in the list definitely has an email-adress in it?


User "Jan Johansson" <address@concealed> has encountered an internal server error
(message diffusion - MSG_ID :
<address@concealed> - LIST :
address@concealed) : 

         Impossible to forward a message to bulletin-owner : undefined in
this list 
  

See logs for more details.