The mailing list for listmasters using Sympa

[address@concealed]

Hi,

I've recently set up a Sympa installation to manage a list of about 3,000
people and have been impressed with its power and superb web interface. 
There's been one thing I wanted to do however and couldn't find in the docs:

Is it possible to email a subset of the subscribers to a list?  The scenario 
is
that we're sending out a form to all list members to fill in and we'd like to
send a reminder to those people who haven't completed the form yet.

I have a list of email addresses for those who have completed the form, and I
wondered if this could be used as a (temporary) "exclude" list... 

Ie (for instance) if there was a way you could use the include2 data source as
an exlusion mechanism: "send emails to everybody on the list except for these
addresses."

Of course, it would be easy enough to set up a new list to do this, but that
doesn't feel like the "clever" way to go about it.

Apologies if I'm missing something obvious... I have studied the docs and FAQ
but have seen nothing on this subject, except for a question about it in 2004.

Best regards,

D I Macdonald