irb(main):035:0* imap = Net::IMAP.new(IMAP_HOST)
irb(main):036:0> imap.authenticate(IMAP_AUTHENTIFICATION, IMAP_USERNAME, IMAP_PASSWROD)
irb(main):039:0> imap.list "", "*"
=> [#<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/bernard@abcdent.fr">, #<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/lipo@abcdent.fr">, #<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/postmaster@abcdent.fr">, #<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/publi@abcdent.fr">, #<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/jerome@abusdangereux.com">, #<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/contact@aeo-eg7.com">, #<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/richard@alrena.com">, #<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/postmaster@buyinparis.net">, #<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/israel@creopolis.com">, #<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/pascal@creopolis.com">, #<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/postmaster@eugenol.com">, #<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/nrieunierburle@eurobdc.com">, #<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/ariane@fantaisy.com">, #<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/julie@fantaisy.com">, #<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/richard@fantaisy.com">, #<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/sales@fantaisy.com">, #<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/tshilumba@jeremie.net">, #<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/nopicture@nopicture.com">, #<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/tabletournante@tabletournante.com">, #<struct Net::IMAP::MailboxList attr=[:Hasnochildren], delim="/", name="user/malesherbes@yayel.com">]
irb(main):040:0> imap.delete "user/lipo@abcdent.fr"
Net::IMAP::NoResponseError: Permission denied
        from /usr/local/lib/ruby/1.8/net/imap.rb:971:in `get_tagged_response'
        from /usr/local/lib/ruby/1.8/net/imap.rb:1022:in `send_command'
        from /usr/local/lib/ruby/1.8/monitor.rb:229:in `synchronize'
        from /usr/local/lib/ruby/1.8/net/imap.rb:1007:in `send_command'
        from /usr/local/lib/ruby/1.8/net/imap.rb:423:in `delete'
        from (irb):40
        from :0
irb(main):041:0>