dovecot - Feb 2015 - [Patch] Allow for more than one recipient_delimiter (a la postfix 2.11)

Hey everyone,

as my previous emails apparently got stuck in a spam filter I'll try this
again.
The patches attached here allow for more than one recipient delimiter in the
address.
Which is allowed in postfix since version 2.11.
E.g. lhw+postfix at ring0.de would be equal to lhw-postfix at ring0.de if
configured that way.
Same as postfix only the first discovered delimiter is taken into account and
the priority
is first to last in the list.

Lennart
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