In the simple mode the script length seems to be
limited to 32768 (?) bytes. When trying to add rules
that would exceed this limit I get "Updatesieve Error:
Cant' update script...
Returned Error: Putting script: Did not specify script
I advanced mode it seems to be possible to have larger
scripts, though this may be due to the fact that there
are no overhead (commented) line from WebSieve.