Ubuntu used a patch for this, but it's just a work-around for now and multiple upstream's developers told me that is not the right approach to use. -- debbug#555134 ...
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ID▼ Status Resolution Sev Product Comp Assignee Reporter Summary▲
254 CLOS DUPL enh Sisyphus sylpheed oddity vserge не производит поиска на LDAP сервере по адресной книге для русских строк в ФИО

File a new bug in the "sylpheed" component of the "Sisyphus" product