Postfix+Dovecotでメール受信が出来ない時のハマりどころ

Postfix + Dovecotでメール送受信のサーバを構築した際に、
かなりハマってしまったのでメモ。

Windowsクライアント側からIMAPでの受信を試みると、本来あるはずのメールが受信されず。
新着メールが無いものとして正常終了する。そこでサーバ側のログを確認。

vi /var/log/maillog

1	vi /var/log/maillog

メールログをみると、ログインはできており、特段エラーも出ていない模様。

10441 Apr  9 03:33:40 hogehoge dovecot: imap-login: Login: user=<info>, method=PLAIN, rip=XXX.XXX.XXX.XXX, lip=YYY.YYY.YYY.YYY, mpid=16225, TLS, session=<aaaaa>
10442 Apr  9 03:33:40 hogehoge dovecot: imap(info): Disconnected: Logged out in=363 out=2762

10441 Apr 9 03:33:40 hogehoge dovecot: imap-login: Login: user=<info>, method=PLAIN, rip=XXX.XXX.XXX.XXX, lip=YYY.YYY.YYY.YYY, mpid=16225, TLS, session=<aaaaa>

10442 Apr 9 03:33:40 hogehoge dovecot: imap(info): Disconnected: Logged out in=363 out=2762

もろもろ調べてみると以下で紹介されていました。

http://d.hatena.ne.jp/himenaotaro/20150930/1443621309

info, adminなどの特定メールアドレスは、
デフォルトでエイリアスに転送されているので、
転送させたくない場合はコメントアウトする必要がある。
（単純な知識不足でした）

#
#  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:     root

# 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
amandabackup:           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

ingres:         root
system:         root
toor:           root
manager:        root
dumper:         root
abuse:          root

newsadm:        news
newsadmin:      news
usenet:         news
ftpadm:         ftp
ftpadmin:       ftp
ftp-adm:        ftp
ftp-admin:      ftp
www:            webmaster
#webmaster:     root
noc:            root
security:       root
hostmaster:     root
#info:          postmaster
marketing:      postmaster
sales:          postmaster
support:        postmaster


# trap decode to catch security attacks
decode:         root

# Person who should get root's mail
#root:          marc
root: hoge@fuga.com

# 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: root

# 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

amandabackup: 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

ingres: root

system: root

toor: root

manager: root

dumper: root

abuse: root

newsadm: news

newsadmin: news

usenet: news

ftpadm: ftp

ftpadmin: ftp

ftp-adm: ftp

ftp-admin: ftp

www: webmaster

#webmaster: root

noc: root

security: root

hostmaster: root

#info: postmaster

marketing: postmaster

sales: postmaster

support: postmaster

# trap decode to catch security attacks

decode: root

# Person who should get root's mail

#root: marc

root: hoge@fuga.com

なるほど。まさにこれ。
info宛てのメールがpostmasterになってたわけですね。

目的のinfoをコメントアウトしたら、Windowsのメールクライアント側で正常に受信が出来ました。