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has the channels message, bayes, and check. While the channels are dynamic in nature, below are the standard ones that are in use as of v3.1.2 (this is not a complete list).

Note: debug mode will show a certain amount of information, while some channels will give more details if the channel is used specifically. ie: "-D" vs "-D bayes".

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spamassassin and spamd channels

accessdb::
all

 The default if _-D_ is specified without any parameters.  Can be useful in combination with other channels to get more output, such as _-D all,bayes_.
 

archive-iterator::
auto-whitelist::
bayes::
check::

 Information related to the Bayesian classifier, including DB access, expiry, etc.  When specifically added, will also output information about individual tokens and their Bayes score.
 

check

 Information related to the [PerMsgStatus]::check() function, which generally includes which rule priorities are being run, the ham/spam decision, message score, and list of (sub)rules that matched.
 

config::
dcc::
dk::
dkim::
dns::
eval::
generic::
hashcash::
ident::
ignore::
info::
ldap::
learn::
locker::
log::
logger::
markup::
message::

 Debug information from the message/MIME parser.
 

metadata::
netcache::
plugin::
prefork::
pyzor::
razor2::
received-header::
replacetags::
reporter::
rules::
spamd::
spf::
textcat::
uri::
uridnsbl::
util::

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