subject/header configuration

I've tried hard to set an header/subject option, but it looks like it does not work as expected. Please find below the log from my conversation with the bot.

[14:19:41] list
[14:19:41] http://images.apple.com/downloads/dashboard/home/recent.rss
http://rss.gazeta.pl/pub/rss/wiadomosci.xml
http://www.eioba.com/index.php/feed,rss/type,newest/lang,pl
http://www.radionewsletter.pl/rss.xml
http://www.wykop.pl/rss/index.xml
[14:19:57] set header APPLE http://images.apple.com/downloads/dashboard/home/recent.rss
[14:19:58] Unknown error setting configuration option
[14:20:05] set header [APPLE] [http://images.apple.com/downloads/dashboard/home/recent.rss]
[14:20:05] Unknown error setting configuration option
[14:20:14] set header {APPLE} {http://images.apple.com/downloads/dashboard/home/recent.rss}
[14:20:14] Unknown error setting configuration option
[14:20:24] set header "APPLE" "http://images.apple.com/downloads/dashboard/home/recent.rss"
[14:20:24] Unknown error setting configuration option
[14:20:27] set header
[14:20:27] header format adjusted
[14:20:31] configuration
[14:20:32] Current configuration:
message type "plaintext"
Headlines will also be delivered when you are XA
subject format:
header format:
At most 64 headlines will be stored for later delivery
The size of a headline message will be limited to about 1024 bytes

Any help will be greatly appreciated.
cheers,
adhd

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