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For some of the Ruby mailing lists, the mailing list software adds a prefix to the subject lines, for example ruby-core:1234. This can confuse the threading in some mail user agents.
In mutt, you can get threading to work using the following variable setting.
# reply regexp, to support MLs like ruby-talk.
set reply_regexp="^(\[[a-z0-9:-]+\][[:space:]]*)?(re([\[0-9\]+])*|aw):[[:space:]]*"
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