Migrating to sieve

[Adam Shostack]

Hi,

As I migrate to sieve, I would like to carry over the logic I had in
procmail rules, which let me take all mail where I'd never sent email
to that address into a final spam catchall, which I called
"neversent."

I see that sieve can't run external programs, and I wonder if that
means I'm SOL, or is there an alternate approach that does roughly the
same thing?

(I understand the general security logic for that decision.  I have
root access on the server in question if that helps.)

Thank you for any help you can provide!

Adam

The procmail code was:

# a bunch of complex shell script to extract From: into a variable of that
# name. 

:0:
* ^TO_$ME
* !? fgrep -q --ignore-case -e "$FROM" $HOME/.lbdb/m_inmail.list
neversent

along with a procmail-outbound setup of:
       
:0hc 
| lbdb-fetchaddr -a 
 
:0
! "$@"