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31-opendkim.md

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openDKIM

  1. /etc/opendkim/opendkim.conf 생성 및 편집

    # /etc/opendkim/opendkim.conf
BaseDirectory           /var/lib/opendkim
Domain                  ryuar.in
KeyFile                 /etc/opendkim/mail2048.private
Selector                mail2048
Socket                  local:/run/opendkim/opendkim.sock
Syslog                  Yes
TemporaryDirectory      /run/opendkim
UMask                   002
RequireSafeKeys         false

  2. BaseDirectory 생성 및 권한 설정

    mkdir -p /var/lib/opendkim
chown opendkim:postfix /var/lib/opendkim

  3. 키 생성

    opendkim-genkey -r -b 2048 -D /etc/opendkim -s mail2048 --subdomains -d ryuar.in

  4. /etc/opendkim/mail2048.txt 확인

    # cat /etc/opendkim/mail2048.txt
mail2048._domainkey     IN      TXT     ( "v=DKIM1; k=rsa; s=email; "
    "p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAuwCHmIoMxHk3cArugm9pCbU/WM1EQm+f2L69PsiJOPEnApMe5zR9mSQwXdfSxuPjeBBLtB/mnNL4gS8E/SqLIFQCGP109uPgv5wGjuXqocnTG+vsQA+jITg8MN9QlwhpAZ7uDwmWf0pknCt9qmOZYCNImGW73NUlGxWHp0rdmV/XGpPCjXjppPEnVFLpJcnADlUnmMF9E2K6ER"
    "/YQUH3m7OJKav9ssCKZFrUWz/iurRGD1nDCpU4etUdHrSRHrhY0bct8RcGqpDg5Q+qxNAZoB0eJuiKsIhplUnOzWO27l1p9kcUO9YkjVhPOpx5OnWHVCIAFiySlZUlgC14y2jaAwIDAQAB" )  ; ----- DKIM key mail2048 for ryuar.in

  5. DNS 설정

    Name Type Data
    _adsp._domainkey.ryuar.in TXT dkim=all
    mail2048._domainkey.ryuar.in TXT v=DKIM1; k=rsa; s=email;p=.......

  6. 권한 설정

    chown opendkim:postfix -R /etc/opendkim
chmod g+rx /etc/opendkim
chmod g+r /etc/opendkim/mail2048.private

cat /dev/null > /usr/lib/tmpfiles.d/opendkim.conf # 재부팅 후에 권한 초기화 되지 않도록.

  7. opendkim 데몬 설정 작성

    # /etc/systemd/system/opendkim.service
[Unit]
Description=OpenDKIM daemon
After=network.target remote-fs.target nss-lookup.target

[Service]
Type=forking
User=opendkim
Group=postfix
ExecStart=/usr/bin/opendkim -x /etc/opendkim/opendkim.conf
RuntimeDirectory=opendkim
RuntimeDirectoryMode=0750

[Install]
WantedBy=multi-user.target

  8. 데몬 활성화 및 시작

    systemctl daemon-reload
systemctl enable opendkim
systemctl start opendkim