PHPスクリプトから送信されたEメールは表示されません。

私はUbuntuを実行している2つのAWS EC2インスタンスでウェブサイトを実行しています。照明を使っています。次のPHPコードは、疑わしい活動について警告する電子メールを正常に送信するために使用されましたが、2020年1月に停止しました。

<?php
    // Function to email notification of suspicious entry
    function emailPossibleSQLInjectionNotification($ipAddress, $emailAddress, $field, $entry, $time)
    {
            $to = "[email protected]";
            $subject = "Suspicious activity";
            $message = "Dear Sir,\n\n" .
                    "The following invalid entry was entered for " . $field . ".\n\n" .
                    $field . ": " .  $entry . "\n" .
                    "Client IP address" . ": " .  $ipAddress . "\n" .
                    "Client email address" . ": " .  $emailAddress . "\n" .
                    "Time" . ": " .  $time . "\n\n" .
                    "Have a wonderful day!\nWeb Site Name.\n";
            $from = "[email protected]";
            $headers = "From:" . $from;
            mail($to,$subject,$message,$headers);
    }
?>

次のような

cat /var/log/mail.log

返品

Mar  5 00:30:41 ip-10-0-1-76 sm-mta[30561]: 02339OqL008906: to=<[email protected]>, ctladdr=<[email protected]> (33/33), delay=1+21:21:17, xdelay=00:00:00, mailer=esmtp, pri=19290583, relay=alt4.gmail-smtp-in.l.google.com., dsn=4.0.0, stat=Deferred: Connection timed out with alt4.gmail-smtp-in.l.google.com.
Mar  5 00:39:01 ip-10-0-1-76 sendmail[30620]: 0250d12h030620: from=root, size=550, class=0, nrcpts=1, msgid=<[email protected]>, bodytype=8BITMIME, relay=root@localhost
Mar  5 00:39:01 ip-10-0-1-76 sm-mta[30621]: 0250d14c030621: from=<[email protected]>, size=848, class=0, nrcpts=1, msgid=<[email protected]>, bodytype=7BIT, proto=ESMTP, daemon=MTA-v4, relay=localhost [127.0.0.1]
Mar  5 00:39:01 ip-10-0-1-76 sendmail[30620]: 0250d12h030620: to=root, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30550, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (0250d14c030621 Message accepted for delivery)
Mar  5 00:39:01 ip-10-0-1-76 sm-mta[30622]: 0250d14c030621: to=<[email protected]>, ctladdr=<[email protected]> (0/0), delay=00:00:00, xdelay=00:00:00, mailer=local, pri=31084, dsn=2.0.0, stat=Sent
 Mar  5 00:40:41 ip-10-0-1-76 sm-mta[30576]: 023MRjPq024050: to=<[email protected]>, ctladdr=<[email protected]> (33/33), delay=1+02:12:56, xdelay=00:10:36, mailer=esmtp, pri=7140592, relay=alt4.gmail-smtp-in.l.google.com. [172.217.218.26], dsn=4.0.0, stat=Deferred: Connection timed out with alt4.gmail-smtp-in.l.google.com.
Mar  5 00:40:41 ip-10-0-1-76 sm-mta[30576]: 023H1exj022946: to=<[email protected]>, ctladdr=<[email protected]> (33/33), delay=1+07:39:01, xdelay=00:00:00, mailer=esmtp, pri=9660592, relay=alt4.gmail-smtp-in.l.google.com., dsn=4.0.0, stat=Deferred: Connection timed out with alt4.gmail-smtp-in.l.google.com.
Mar  5 00:40:41 ip-10-0-1-76 sm-mta[30576]: 02339OqL008906: to=<[email protected]>, ctladdr=<[email protected]> (33/33), delay=1+21:31:17, xdelay=00:00:00, mailer=esmtp, pri=19380583, relay=alt4.gmail-smtp-in.l.google.com., dsn=4.0.0, stat=Deferred: Connection timed out with alt4.gmail-smtp-in.l.google.com.
Mar  5 00:50:41 ip-10-0-1-76 sm-mta[30646]: 024KKwfi029723: to=<[email protected]>, ctladdr=<[email protected]> (33/33), delay=04:29:43, xdelay=00:10:36, mailer=esmtp, pri=1290584, relay=alt4.gmail-smtp-in.l.google.com. [172.217.218.26], dsn=4.0.0, stat=Deferred: Connection timed out with alt4.gmail-smtp-in.l.google.com.
Mar  5 00:50:41 ip-10-0-1-76 sm-mta[30646]: 023H1exj022946: to=<[email protected]>, ctladdr=<[email protected]> (33/33), delay=1+07:49:01, xdelay=00:00:00, mailer=esmtp, pri=9750592, relay=alt4.gmail-smtp-in.l.google.com., dsn=4.0.0, stat=Deferred: Connection timed out with alt4.gmail-smtp-in.l.google.com.
Mar  5 00:50:41 ip-10-0-1-76 sm-mta[30646]: 02339OqL008906: to=<[email protected]>, ctladdr=<[email protected]> (33/33), delay=1+21:41:17, xdelay=00:00:00, mailer=esmtp, pri=19470583, relay=alt4.gmail-smtp-in.l.google.com., dsn=4.0.0, stat=Deferred: Connection timed out with alt4.gmail-smtp-in.l.google.com.
Mar  5 01:00:41 ip-10-0-1-76 sm-mta[30660]: 023MRjPq024050: to=<[email protected]>, ctladdr=<[email protected]> (33/33), delay=1+02:32:56, xdelay=00:10:36, mailer=esmtp, pri=7230592, relay=alt4.gmail-smtp-in.l.google.com. [172.217.218.26], dsn=4.0.0, stat=Deferred: Connection timed out with alt4.gmail-smtp-in.l.google.com.
Mar  5 01:00:41 ip-10-0-1-76 sm-mta[30660]: 023H1exj022946: to=<[email protected]>, ctladdr=<[email protected]> (33/33), delay=1+07:59:01, xdelay=00:00:00, mailer=esmtp, pri=9840592, relay=alt4.gmail-smtp-in.l.google.com., dsn=4.0.0, stat=Deferred: Connection timed out with alt4.gmail-smtp-in.l.google.com.
Mar  5 01:00:41 ip-10-0-1-76 sm-mta[30660]: 02339OqL008906: to=<[email protected]>, ctladdr=<[email protected]> (33/33), delay=1+21:51:17, xdelay=00:00:00, mailer=esmtp, pri=19560583, relay=alt4.gmail-smtp-in.l.google.com., dsn=4.0.0, stat=Deferred: Connection timed out with alt4.gmail-smtp-in.l.google.com.
Mar  5 01:07:30 ip-10-0-1-76 sendmail[30700]: 02517Uj6030700: from=www-data, size=342, class=0, nrcpts=1, msgid=<[email protected]>, relay=www-data@localhost
Mar  5 01:07:30 ip-10-0-1-76 sm-mta[30701]: 02517UA4030701: from=<[email protected]>, size=583, class=0, nrcpts=1, msgid=<[email protected]>, proto=ESMTP, daemon=MTA-v4, relay=localhost [127.0.0.1]
Mar  5 01:07:30 ip-10-0-1-76 sendmail[30700]: 02517Uj6030700: [email protected], ctladdr=www-data (33/33), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30342, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (02517UA4030701 Message accepted for delivery)
Mar  5 01:09:01 ip-10-0-1-76 sendmail[30846]: 025191nX030846: from=root, size=550, class=0, nrcpts=1, msgid=<[email protected]>, bodytype=8BITMIME, relay=root@localhost
Mar  5 01:09:01 ip-10-0-1-76 sm-mta[30847]: 025191Bc030847: from=<[email protected]>, size=848, class=0, nrcpts=1, msgid=<[email protected]>, bodytype=7BIT, proto=ESMTP, daemon=MTA-v4, relay=localhost [127.0.0.1]
Mar  5 01:09:01 ip-10-0-1-76 sendmail[30846]: 025191nX030846: to=root, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30550, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (025191Bc030847 Message accepted for delivery)
Mar  5 01:09:01 ip-10-0-1-76 sm-mta[30848]: 025191Bc030847: to=<[email protected]>, ctladdr=<[email protected]> (0/0), delay=00:00:00, xdelay=00:00:00, mailer=local, pri=31084, dsn=2.0.0, stat=Sent

次のような

$ sudo netstat -ntlp | grep sendmail

返品

tcp        0      0 127.0.0.1:587           0.0.0.0:*               LISTEN      
1337/sendmail: MTA:
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      
 1337/sendmail: MTA:

クラウドのAWS EC2インスタンスでアプリケーションを実行しているため、ISPは問題になりません。

私は気づいた

df -i

返品

Filesystem     Inodes  IUsed  IFree IUse% Mounted on
udev           124432    357 124075    1% /dev
tmpfs          126762    472 126290    1% /run
/dev/xvda1     917504 607710 309794   67% /
tmpfs          126762      1 126761    1% /dev/shm
tmpfs          126762      6 126756    1% /run/lock
tmpfs          126762     16 126746    1% /sys/fs/cgroup
tmpfs          126762      4 126758    1% /run/user/1000

したがって、これはinodeの問題ではありません。

 ps -e | grep sendmail

返品

  1337 ?        00:00:08 sendmail-mta
  4109 ?        00:00:00 sendmail-mta
  4320 ?        00:00:00 sendmail-mta

メッセージはスパムフォルダにはまったく表示されません。

編集する：

私も試しました

ubuntu@ip-10-0-1-76:~$ sendmail [email protected]
Test
ubuntu@ip-10-0-1-76:~$

まだ Gmail アカウントにメッセージが表示されません。