Recipe spesiffic variable assignment

Good Day:

I need to do this:

1.  Search the header for a particular set of senders.

2.  If any one of them is found, set a variable to zero.

Unthinkingly, I was doing this, until I got "ignored = 0" errors:

:0 flags
* conditions
duplicate = 0

This failing, I am now doing:

:0 flags
* conditions
{ duplicate = 0 }

Is there any other way?

Also, as a side note, am I correct that this is a non-delivering recipe,
without having to specify "c" as a flag?

Thanks

Luke

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