mdadm depends on postfix

On installing mdadm package, it also install postfix.

I don't really get to understand why we need a MTA to create a RAID array.

Thank you!

Maicon Vinicius Nunes

Description: Ubuntu 12.04 LTS
Release: 12.04

mdadm:
  Installed: 3.2.5-1ubuntu0.2
  Candidate: 3.2.5-1ubuntu0.2
  Version table:
 *** 3.2.5-1ubuntu0.2 0
        500 http://br.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     3.2.3-2ubuntu1 0
        500 http://br.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

Expected behavior: install mdadm and its real dependencies
What happened: installed postfix

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: mdadm 3.2.5-1ubuntu0.2
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
Date: Fri Sep 28 01:11:12 2012
InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Release amd64 (20120424.1)
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 002: ID 0e0f:0003 VMware, Inc. Virtual Mouse
 Bus 002 Device 003: ID 0e0f:0002 VMware, Inc. Virtual USB Hub
MDadmExamine.dev.sda:
 /dev/sda:
    MBR Magic : aa55
 Partition[0] : 88307712 sectors at 2048 (type 83)
 Partition[1] : 16543746 sectors at 88311806 (type 05)
MDadmExamine.dev.sda1: Error: command ['/sbin/mdadm', '-E', '/dev/sda1'] failed with exit code 1: mdadm: No md superblock detected on /dev/sda1.
MDadmExamine.dev.sda2:
 /dev/sda2:
    MBR Magic : aa55
 Partition[0] : 16543744 sectors at 2 (type 82)
MDadmExamine.dev.sda5: Error: command ['/sbin/mdadm', '-E', '/dev/sda5'] failed with exit code 1: mdadm: No md superblock detected on /dev/sda5.
MDadmExamine.dev.sdb:
 /dev/sdb:
    MBR Magic : aa55
 Partition[0] : 209713152 sectors at 2048 (type 83)
MDadmExamine.dev.sdb1: Error: command ['/sbin/mdadm', '-E', '/dev/sdb1'] failed with exit code 1: mdadm: No md superblock detected on /dev/sdb1.
MachineType: VMware, Inc. VMware Virtual Platform
ProcEnviron:
 LANGUAGE=en_US:en
 LC_CTYPE=UTF-8
 TERM=xterm-256color
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-23-generic root=UUID=24639c7a-389f-4dbb-8ebd-95ddf76a4a6d ro
SourcePackage: mdadm
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/22/2012
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: 6.00
dmi.board.name: 440BX Desktop Reference Platform
dmi.board.vendor: Intel Corporation
dmi.board.version: None
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 1
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd06/22/2012:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A:
dmi.product.name: VMware Virtual Platform
dmi.product.version: None
dmi.sys.vendor: VMware, Inc.
etc.blkid.tab: <device DEVNO="0x0811" TIME="1348134460.707165" UUID="5f38a0a8-f03e-4502-a345-6b77e1db5ebe" TYPE="ext4">/dev/sdb1</device>
initrd.files:
 lib/modules/3.2.0-23-generic/kernel/drivers/net/ethernet/amd/nmclan_cs.ko
  lib/modules/3.2.0-23-generic/kernel/drivers/net/ethernet/amd/amd8111e.ko
  lib/modules/3.2.0-23-generic/kernel/drivers/net/ethernet/amd/pcnet32.ko