errors & procmail locking

[Matthias Andree]

On Sat, 19 Jun 2004, David Relson wrote:

> Matthias,
> 
> Without procmail's locking the frequency of errors goes up.  The most
> recent is below.  It shows messages arriving 2 seconds apart and a
> couple of error/rescue sequences.
> 
> David
> 
> 
> procmail: Opening "mail.backup"
> procmail: [31706] Sat Jun 19 10:39:58 2004
> procmail: Opening "mail.backup"
> 
> procmail: Executing "bogofilter,-p,-l,-e,-u,-U"
> procmail: Executing "bogofilter,-p,-l,-e,-u,-U"
> procmail: [31710] Sat Jun 19 10:40:00 2004
> procmail: Error while writing to "bogofilter"
> procmail: Rescue of unfiltered data succeeded
> procmail: [31710] Sat Jun 19 10:40:00 2004

I cannot reproduce anything of this. Why does bogofilter stop accepting
data or bail out with error?

What is -U anyway?