我无法从我的服务器(Ubuntu14 / mailinabox)发送邮件到gmail

Question

我在Digital Ocean上的邮件服务器有问题。我的邮件服务器使用的是“mail in a box”应用程序。每次，当我尝试发送邮件到例如: some@gmail.com时，我都得到了相同的响应：

Undelivered Mail Returned to Sender

From
MAILER-DAEMON@mail.sporta.io

This is the mail system at host mail.sporta.io.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<denis.rohlinsky@gmail.com>: host gmail-smtp-in.l.google.com[108.177.126.27]
    said: 550-5.7.1 This message does not have authentication information or
    fails to pass 550-5.7.1 authentication checks. To best protect our users
    from spam, the 550-5.7.1 message has been blocked. Please visit 550-5.7.1
    https://support.google.com/mail/answer/81126#authentication for more 550
    5.7.1 information. v27si4529334edm.111 - gsmtp (in reply to end of DATA
    command)

Reporting-MTA: dns; mail.sporta.io
X-Postfix-Queue-ID: 83217200D6
X-Postfix-Sender: rfc822; admin@sporta.io
Arrival-Date: Fri,  1 Feb 2019 20:27:51 +0100 (CET)

Final-Recipient: rfc822; denis.rohlinsky@gmail.com
Original-Recipient: rfc822;denis.rohlinsky@gmail.com
Action: failed
Status: 5.7.1
Remote-MTA: dns; gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 550-5.7.1 This message does not have authentication
    information or fails to pass 550-5.7.1 authentication checks. To best
    protect our users from spam, the 550-5.7.1 message has been blocked. Please
    visit 550-5.7.1
    https://support.google.com/mail/answer/81126#authentication for more 550
    5.7.1 information. v27si4529334edm.111 – gsmtp


Subject
test
From
admin@sporta.io
To
denis.rohlinsky@gmail.com
Date
Today 21:27

附言:我通过其他服务(向mail.io、mail.com、mail.ru发送消息)检查了我的服务器，它工作正常。我可以发送邮件到这个服务没有任何问题，但gmail继续阻止我的邮件。我需要什么来解决这个问题？

要将邮件发送到mail.com，请成功mail.ru

从gmail接收我的消息

Answer 1

使用Gmail注册发送电子邮件地址，并等待其通过身份验证。Gmail将只接受来自gmail地址或已知与Gmail帐户关联的地址的邮件。

Answer 2

正如Juan在回复here中提到的，您可能需要添加所需的DNS TXT记录。或者，你可以查看Google的Postmaster Tools。它可能会为手头的问题提供一些线索。

Answer 3

未经身份验证的

电子邮件通常会被拒绝或标记为垃圾邮件，以保护收件人免受网络钓鱼诈骗。出于安全原因，带有附件的未经验证的电子邮件可能会被完全拒绝。

要确保Gmail可以对您进行身份验证：

从相同的IP地址发送

• 保留有效的反向DNS记录指向您的域

的IP地址

• 为每个批量邮件

在“From：”标题中选择相同的地址

对于mail.sporta.io反向域名解析-找不到PTR记录。

找不到dmarc:sporta.io的DNS记录。

找不到spf:sporta.io的DNS记录。