Log Message:
mail/postfix: update to 3.6.1

3.6.1 (2021-06-14)

Fixed in Postfix 3.6.1, 3.5.11, 3.4.21, 3.3.18:

  * Bugfix (introduced: Postfix 2.11): the command "postmap
    lmdb:/file/name" (create LMDB database from textfile) handled
    duplicate input keys ungracefully, discarding entries stored
    up to and including the duplicate key, and causing a double
    free() call with lmdb versions 0.9.17 and later. Reported by
    Adi Prasaja; double free() root cause analysis by Howard Chu.

Fixed in Postfix 3.6.1, 3.5.11, 3.4.21:

  * Typo (introduced: Postfix 3.4): silent_discard should be
    silent-discard in BDAT_README.