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Sendmail から Postfix へ

Posted at

経緯

結論。
今後は、「後継のPostfixを使え」ということらしい。

自宅開発環境でメールが飛ばないことは知っていたが、面倒臭そうなので放置していた。
が、一念発起し、sendmailまわりの設定を調査。

しかしながら、調べていくうちにsendmailは非推奨になっているということを知った。
今後は、「後継のPostfixを使え」ということらしい。

制限事項

  • 開発環境での使用を前提としています。
  • 本番はこの限りではないと思われます。

構築手順

  1. sendmailを削除
    sudo apt remove sendmail -y
    sudo apt autoremove -y
    
  2. Postfixの設定ファイルを配置
    sudo cp /usr/share/postfix/main.cf.dist /etc/postfix/main.cf
    
  3. Postfixの設定ファイルを編集
    diff /usr/share/postfix/main.cf.dist /etc/postfix/main.cf
    82c82
    < #mail_owner = postfix
    ---
    > mail_owner = postfix
    98c98
    < #myhostname = host.domain.tld
    ---
    > myhostname = messiah
    127c127
    < #myorigin = $mydomain
    ---
    > myorigin = $mydomain
    141c141
    < #inet_interfaces = all
    ---
    > inet_interfaces = all
    189c189
    < #mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
    ---
    > mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
    232c232
    < #local_recipient_maps = unix:passwd.byname $alias_maps
    ---
    > local_recipient_maps = unix:passwd.byname $alias_maps
    583c583
    < #smtpd_banner = $myhostname ESMTP $mail_name
    ---
    > smtpd_banner = $myhostname ESMTP
    585c585
    < smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
    ---
    > #smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
    659c659
    < sendmail_path =
    ---
    > sendmail_path = /usr/sbin/postfix
    664c664
    < newaliases_path =
    ---
    > newaliases_path = /usr/bin/mailq
    669c669
    < mailq_path =
    ---
    > mailq_path = /usr/bin/mailq
    675c675
    < setgid_group =
    ---
    > setgid_group = postdrop
    679c679
    < html_directory =
    ---
    > #html_directory =
    683c683
    < manpage_directory =
    ---
    > #manpage_directory =
    688c688
    < sample_directory =
    ---
    > #sample_directory =
    692c692
    < readme_directory =
    ---
    > #readme_directory =
    693a694,696
    >
    > message_size_limit = 10485760
    > mailbox_size_limit = 1073741824
    
  4. Postfixを再起動
    sudo newaliases
    sudo /etc/init.d/postfix restart
    

動作確認

  • テストメールを送信してみる
    sudo echo -e 'Subject: Hello!\n\nHello!\nWorld' | sendmail -f {fromメールアドレス} {toメールアドレス}
    
    • 送信されたメールが受信できることを確認

参考

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