运行在 docker 容器中时找不到 Sendmail 主机

Question

我正在尝试从 docker 容器发送电子邮件。我能看到的最简单的单行代码来自 earlier 堆栈溢出答案：

docker run --rm --net="host" php:fpm-alpine sh -c 'echo "Subject: test" | sendmail -v your@mail.com'

我将 your@mail.com 更改为我的 gmail 地址和运行命令。问题是我现在在我的终端中得到这个输出：

sendmail: recv:'220 mail.example.com ESMTP ready'
sendmail: send:'EHLO linuxkit-025000000001'
sendmail: recv:'250 mail.example.com'
sendmail: linuxkit-025000000001: Host not found

为了获得简单的示例邮件，我需要做哪些不同的事情？

我想我已经接近了，因为我正在从 sendmail 获取输出。

Answer 1

Sendmail 正在尝试通过位于此处的 SMTP 服务器中继您的电子邮件：mail.example.com。这是此图像上 sendmail 的内置默认配置。

您要做的是为 sendmail 传递 google SMTP 配置，如下所示：

echo "Subject: test" | sendmail -v -f your@mail.com -au<your-gmail-account> -ap<your-gmail-password> -H 'openssl s_client -quiet -tls1 -connect smtp.gmail.com:465' your@mail.com

实际示例：

gmail 帐户：您的@gmail.com
gmail 密码：123456

看起来像这样：

echo "Subject: test" | sendmail -v -f your@mail.com -auyour@gmail.com -ap123456 -H 'openssl s_client -quiet -tls1 -connect smtp.gmail.com:465' your@mail.com

sendmail --help

供参考，这里是sendmail --help。您可以从您使用的图像中获取它：

docker run --rm php:fpm-alpine sendmail --help

BusyBox v1.29.3 (2019-01-24 07:45:07 UTC) multi-call binary.

Usage: sendmail [-tv] [-f SENDER] [-amLOGIN 4<user_pass.txt | -auUSER -apPASS]
                [-w SECS] [-H 'PROG ARGS' | -S HOST] [RECIPIENT_EMAIL]...

Read email from stdin and send it

Standard options:
        -t              Read additional recipients from message body
        -f SENDER       For use in MAIL FROM:<sender>. Can be empty string
                        Default: -auUSER, or username of current UID
        -o OPTIONS      Various options. -oi implied, others are ignored
        -i              -oi synonym, implied and ignored

Busybox specific options:
        -v              Verbose
        -w SECS         Network timeout
        -H 'PROG ARGS'  Run connection helper. Examples:
                openssl s_client -quiet -tls1 -starttls smtp -connect smtp.gmail.com:25
                openssl s_client -quiet -tls1 -connect smtp.gmail.com:465
                        $SMTP_ANTISPAM_DELAY: seconds to wait after helper connect
        -S HOST[:PORT]  Server (default $SMTPHOST or 127.0.0.1)
        -amLOGIN        Log in using AUTH LOGIN (-amCRAM-MD5 not supported)
        -auUSER         Username for AUTH
        -apPASS         Password for AUTH

If no -a options are given, authentication is not done.
If -amLOGIN is given but no -au/-ap, user/password is read from fd #4.
Other options are silently ignored; -oi is implied.
Use makemime to create emails with attachments.

运行 在 docker 容器中时找不到 Sendmail 主机

Sendmail host not found when running inside a docker container

docker

sendmail

alpine

sendmail --help

运行在 docker 容器中时找不到 Sendmail 主机