[Dovecot] Patch for vpopmail roaming users support

[Nicolas Croiset (Campus Grenoble 90,8)]

Hi Matt,

I try on my setup the patch you made last month and the 
/home/vpopmail/etc/open-smtp leaves empty. If I go back with the 
vpopmail mode, it is working.

I don't understand what's happened really.

Bye.
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