If your ISP does not provide a custom sort field and you experince the following errors occuring when Multidrop is enabled and the "Select Sort Method (for multi-drop)" is set to Default
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fetchmail: warning: multidrop for pop3.mypopserver.com requires envelope option!
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fetchmail: warning: Do not ask for support if all mail goes to postmaster!
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Set "Select Sort Method (for multi-drop) to 'Received'