Issue #6996 has been reported by eike.rb (Eike Dierks). ---------------------------------------- Bug #6996: Documentation for OptionParser includes an email adress which is not deliverable https://bugs.ruby-lang.org/issues/6996 Author: eike.rb (Eike Dierks) Status: Open Priority: Normal Assignee: Category: Target version: ruby -v: ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-darwin10] In the Documentation for OptionParser http://ruby-doc.org/stdlib-1.9.3/libdoc/optparse/rdoc/OptionParser.html There's an email adress included: The above examples should be enough to learn how to use this class. If you have any questions, email me (gsinclair / soyabean.com.au) and I will update this document. This email adress is not currently reachable. SMTP error from remote mail server after RCPT TO:<gsinclair / soyabean.com.au>: Recipient address rejected: "USER UNKNOWN" The email address should be removed from the documentation -- http://bugs.ruby-lang.org/