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Description of problem:
Since I installed the spamassassin update (3.1.8-1) this morning, sa-learn gives errors like this:

archive-iterator: invalid (undef) format in target list, 2 at /usr/lib/perl5/vendor_perl/5.8.8/Mail/SpamAssassin/ArchiveIterator.pm line 724, <STDIN> line 1.
Learned tokens from 1 message(s) (1 message(s) examined)

This is sa-learn invoked manually (in mutt: | sa-learn --spam); spamassassin inside evolution doesn't seem to give errors

Version-Release number of selected component (if applicable):
spamassassin-3.1.8-1.fc6.i386

How reproducible:
Always


Steps to Reproduce:
1. open a mailbox in mutt
2. select spam message
3. type '| sa-learn --spam' (actually, I have this bound to a key of course)


Actual Results:
archive-iterator: invalid (undef) format in target list, 2 at /usr/lib/perl5/vendor_perl/5.8.8/Mail/SpamAssassin/ArchiveIterator.pm line 724, <STDIN> line 1.
Learned tokens from 1 message(s) (1 message(s) examined)


Expected Results:
Until yesterday, only the message 
Learned tokens from 1 message(s) (1 message(s) examined)
was shown

Additional info: