迷惑メール対策の SPF（Sender Policy Framework）について確認する spfquery の使い方です。
Arch Linux でのインストール
sudo pacman -S perl-mail-spf-query
pass となるケース
SPFQUERY=/usr/bin/vendor_perl/spfquery
#
$SPFQUERY --ip 133.130.98.29 --mail-from from@ekzemplaro.org --helo gmail.com
#
echo
$SPFQUERY -i 133.130.98.29 -m from@ekzemplaro.org -h gmail.com
実行結果
pass
Please see http://www.openspf.org/why.html?sender=from%40ekzemplaro.org&ip=133.130.98.29&receiver=spfquery: 133.130.98.29 contains 133.130.98.29
spfquery: domain of from@ekzemplaro.org designates 133.130.98.29 as permitted sender
Received-SPF: pass (spfquery: domain of from@ekzemplaro.org designates 133.130.98.29 as permitted sender) client-ip=133.130.98.29; envelope-from=from@ekzemplaro.org; helo=gmai.com;
none となるケース
```bash
SPFQUERY=/usr/bin/vendor_perl/spfquery
#
$SPFQUERY -i 133.130.98.29 -m from@www.ekzemplaro.org -h gmail.com
実行結果
none
SPF: domain of sender from@www.ekzemplaro.org does not designate mailers
spfquery: domain of from@www.ekzemplaro.org does not designate permitted sender hosts
Received-SPF: none (spfquery: domain of from@www.ekzemplaro.org does not designate permitted sender hosts) client-ip=133.130.98.29; envelope-from=from@www.ekzemplaro.org; helo=gmai.com;
softfail となるケース
```bash
SPFQUERY=/usr/bin/vendor_perl/spfquery
#
$SPFQUERY -i 133.130.98.28 -m from@ekzemplaro.org -h gmail.com
実行結果
softfail
Please see http://www.openspf.org/why.html?sender=from%40ekzemplaro.org&ip=133.130.98.28&receiver=spfquery
spfquery: transitioning domain of from@ekzemplaro.org does not designate 133.130.98.28 as permitted sender
Received-SPF: softfail (spfquery: transitioning domain of from@ekzemplaro.org does not designate 133.130.98.28 as permitted sender) client-ip=133.130.98.28; envelope-from=from@ekzemplaro.org; helo=gmai.com;
SPF のチェックをするページ
>[SPF Record Testing Tools](http://www.kitterman.com/spf/validate.html)
>[Mx TOOLBOX](https://mxtoolbox.com/spf.aspx)