No need for this aliases file.

roles/taiga/files/aliases

@@ -1,91 +0,0 @@
-#
-#  Aliases in this file will NOT be expanded in the header from
-#  Mail, but WILL be visible over networks or from /bin/mail.
-#
-#	>>>>>>>>>>	The program "newaliases" must be run after
-#	>> NOTE >>	this file is updated for any changes to
-#	>>>>>>>>>>	show through to sendmail.
-#
-
-# Basic system aliases -- these MUST be present.
-mailer-daemon:	postmaster
-postmaster:	sysadmin-main
-
-# General redirections for pseudo accounts.
-bin:		root
-daemon:		root
-adm:		root
-lp:		root
-sync:		root
-shutdown:	root
-halt:		root
-mail:		root
-#news:		root
-uucp:		root
-operator:	root
-games:		root
-gopher:		root
-ftp:		root
-#nobody:		root
-radiusd:	root
-nut:		root
-dbus:		root
-vcsa:		root
-canna:		root
-wnn:		root
-rpm:		root
-nscd:		root
-pcap:		root
-apache:		root
-webalizer:	root
-dovecot:	root
-fax:		root
-quagga:		root
-radvd:		root
-pvm:		root
-amanda:		root
-privoxy:	root
-ident:		root
-named:		root
-xfs:		root
-gdm:		root
-mailnull:	root
-postgres:	root
-sshd:		root
-smmsp:		root
-postfix:	root
-netdump:	root
-ldap:		root
-squid:		root
-ntp:		root
-mysql:		root
-desktop:	root
-rpcuser:	root
-rpc:		root
-nfsnobody:	root
-notifications:	root
-
-ingres:		root
-system:		root
-toor:		root
-manager:	root
-dumper:		root
-abuse:		root
-nagios:		root
-
-newsadm:	news
-newsadmin:	news
-usenet:		news
-ftpadm:		ftp
-ftpadmin:	ftp
-ftp-adm:	ftp
-ftp-admin:	ftp
-
-# trap decode to catch security attacks
-decode:		root
-
-# Person who should get root's mail
-root:		sysadmin-main
-
-pagure:     /dev/null
-reply:      /dev/null

roles/taiga/tasks/main.yml

@@ -31,10 +31,6 @@
 
 ### Real quick, let's setup postfix for mail on the side.
 ### if we ever move this internally, we'll just use bastion.
-- name: Add the /etc/aliases file
-  copy: src=aliases dest=/etc/aliases owner=root mode=644
-  notify: restart postfix
-  tags: taiga
 - name: Set postfix to run on boot
   service: name=postfix state=running enabled=yes
   tags: taiga