[Dovecot] [PATCH] LMTP: Permit user IDs containing recipient_delimiter

[Ulrich Zehl]

The Dovecot 2.1 LMTP server currently always strips the address extension
from a recipient address (if recipient_delimiter is set), meaning user IDs
cannot contain the recipient delimiter character, e.g. "user+foo" is not
supported.

This was surprising for me, as Postfix behaves differently in this regard:
It first looks up "user+foo", and only then "user".

The attached patch works for me and brings Dovecot's behavior in line with
Postfix. Please let me know what you think about it.
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