批量电子邮件失败，显示421 4.7.0

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问题描述

我需要与我的组织一起发送批量电子邮件.我是Java Mail API，并使用以下配置发送邮件.

I have a requirement to send bulk emails with in my organization. I am Java Mail API and sending the mails with below config.

        props.put("mail.transport.protocol", "smtp");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.host", "smtp.gmail.com");
        props.put("mail.smtp.port", "587");

邮件#1发件人:[email protected]到:[email protected]

Mail#1From: [email protected]: [email protected]

邮件#2发件人:[email protected]到:[email protected]

Mail#2From: [email protected]: [email protected]

...

邮件是循环触发的.

问题:前80封电子邮件已成功发送.从第81封邮件中，我失败了，出现了10-15封邮件的错误，以后又成功发送了几封邮件.

Problem:First 80 emails sent successfully. From 81st mail I am failing with below error for 10-15 emails and later few mails are sent successfully.

743封电子邮件中有400封失败& 343是成功的.

Out of 743 emails 400 Failed & 343 are success.

    INFO   | jvm 1    | 2017/08/18 07:25:54 | com.sun.mail.smtp.SMTPSendFailedException: 421 4.7.0 Try again later, closing connection. (MAIL) xsdsfasdsa.96 - gsmtp
    INFO   | jvm 1    | 2017/08/18 07:25:54 |
    INFO   | jvm 1    | 2017/08/18 07:25:54 |   at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2108)
    INFO   | jvm 1    | 2017/08/18 07:25:54 |   at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1609)
    INFO   | jvm 1    | 2017/08/18 07:25:54 |   at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1117)

请帮助我解决该问题.
smtp.gmail.com上是否有特定的每分钟限制?

谢谢，林蛙

Thanks,Rana

推荐答案

是的，我认为通过Gmail发送SMPT邮件每分钟有一定的限制(根据我的经验，该限制大约为80，80 -).但这不是100％的硬性限制，而是Gmail认为应有的硬性限制.

Yes, I think there is a per minute limit for sending SMPT messages via Gmail (around 80 in my experience that of others around 80-100). But it's not a 100% hard limit but some sort of soft limit that is enforced when Gmail thinks its due.

首先，在G Suite管理区域中检查您的消息队列.如果队列很大且仍在增长，则发送速度太快.

First, check your message queue in G Suite admin area. If the queue is huge and still growing you send too fast.

一些有用的链接:

G Suite SMTP错误参考
Gmail 帐户的带宽限制
G Suite中的Gmail发送限制
批量发件人指南

G Suite SMTP Error Reference
Gmail Bandwidth limits for accounts
Gmail sending limits in G Suite
Bulk Senders Guidelines

没有进一步的解释，当您遭受错误的困扰时

There is no further explanation what's wrong when you suffer from the error

一般建议:

您可以使用池化SMTP，例如 https://nodemailer.com/smtp/pooled/

发送速度不要太快
一次发送不超过50封电子邮件
不要假设Gmail是本地系统.这是一项外部服务，它使用复杂的方法来使电子邮件在全球范围内可用，从而扩展了一项已有42年历史的发明，远非完美.
不要尝试愚蠢的事情，否则Gmail会惩罚您.

do not send too fast
do not send more than 50 emails at once
do not assume Gmail is a local system. It's an external service that uses sophisticated methods to make email globally available extending a 42-year-old invention that is far from perfect.
do not try stupid things or Gmail will punish you.

道德:如果发送大量电子邮件，最好使用自己的电子邮件服务器.

Moral: If sending a large amount of email, it's probably best to use your own email server.

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