Unfortunately, those do not directly address claws-mail.
Plus, the wiki is not regularly updated.
The error regarding res_send is from when torsocks initializes itself.
Your exact error is reported on the torsocks website at http://code.google.com/p/torsocks/issues/detail?id=3 .
The res_send function is used to do DNS lookups of hostnames.
If your only use of torsocks is for this mail application, you could work around the problem by editing wherever your mail server host is specified to have an IP address instead of the hostname.
To get the hostname using the Tor network, you can use the tor-resolve utility (in the same directory as the main tor executable).
Note that the torify software is a project independent of Tor itself, so, unless there are torify developers quietly hanging out here, we are not experts in supporting it.