Dear Maintainer,
*** Please consider answering these questions, where appropriate ***

   * What led up to the situation?
   tail auth.log
   * What exactly did you do (or not do) that was effective (or
     ineffective)?
     n/a
   * What was the outcome of this action?
   n/a
   * What outcome did you expect instead?
   n/a

*** End of the template - remove these lines ***

My auth.log is becoming full of these errors:

Oct  9 14:40:42 nigelhorne sm-mta[9799]: could not find auxprop plugin, was searching for [all]

Google gives me no hints on how to proceed.