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虽然日志中没有错误，但电子邮件发送在Google App Engine上无效

[英]Email sending isn't working on Google App Engine though no errors in logs

原文 2016-03-03 10:58:22 7 1 java/ email/ google-app-engine/ html-email

[I have looked at all the questions related to this topic on SO but neither of them seems to explain the behaviour I am seeing]. [我在SO上查看了与此主题相关的所有问题，但它们似乎都没有解释我所看到的行为]。

I have two projects A (3-4 months old) and B (0.5 month old) and both use a common class to send email on Google App Engine. 我有两个项目A（3-4个月大）和B（0.5个月大），两个项目都使用通用课程在Google App Engine上发送电子邮件。 Both projects are currently running in the free quota. 这两个项目目前都在免费配额中运行。

When I invoke the common Emailer class from Project A, the email gets sent; 当我从项目A调用公共Emailer类时，会发送电子邮件; invoking from B does not produce any errors in the log file (the logs show correct information in email fields), but the email never arrives at the recipient address. 从B调用不会在日志文件中产生任何错误（日志在电子邮件字段中显示正确的信息），但电子邮件永远不会到达收件人地址。 I have checked Spam folder/label and even searched entire mailbox for mail from:appspotmail.com (see below) and nothing. 我检查了垃圾邮件文件夹/标签，甚至搜索整个邮箱的邮件from:appspotmail.com （见下文），什么都没有。

I have verified that for each email sent, the email quota on Developer Console (at console.cloud.google.com/appengine/quotadetails?project= project-b &moduleId=default) registers another recipient, so obviously Google code is being invoked correctly (the email in question is for the reset password, so has only recipient). 我已经确认，对于发送的每封电子邮件，开发者控制台上的电子邮件配额（在console.cloud.google.com/appengine/quotadetails?project= project -b ＆moduleId = default）会注册另一个收件人，因此显然正在正确调用Google代码（有问题的电子邮件是重置密码，因此只有收件人）。

I tried sending as admin@mydomain.com ( admin@mydomain.com has been added to list of Email API authorized senders on the settings page of app B) and also as admin@project-b.appspotmail.com and neither one works. 我尝试发送为admin@mydomain.com （ admin@mydomain.com已添加到应用B的设置页面上的Email API授权发件人列表），也作为admin@project-b.appspotmail.com ，但admin@project-b.appspotmail.com 。

On project A so far I have always sent email as admin@project-a.appspotmail.com (where project-a is the id of my GAE app) and have never faced any issue of this sort. 到目前为止，在项目A上，我总是发送电子邮件为admin@project-a.appspotmail.com （其中project-a是我的GAE应用程序的ID），并且从未遇到任何此类问题。

What is going on here? 这里发生了什么？ Is there some additional setting I am missing out on? 我错过了一些额外的设置吗？

NB: This probably doesn't have any bearing, but mentioning in the interests of completeness: the recipient email address is of the form myaccount+xyz@gmail.com instead of the more common myaccount@gmail.com . 注意：这可能没有任何影响，但为了完整性而提及：收件人电子邮件地址的格式为myaccount+xyz@gmail.com而不是更常见的myaccount@gmail.com 。 However, manually sending email to this address from within Gmail works, so that shouldn't be an issue. 但是，从Gmail中手动向此地址发送电子邮件是有效的，因此这不应成为问题。

Update 1 更新1

Based on suggestions here and things that I've tried since posting this question, here are some updates: 基于此处的建议以及自发布此问题以来我尝试过的内容，以下是一些更新：

I set up an email bounce handler as suggested but it hasn't been invoked yet (as per the logs). 我按照建议设置了一个电子邮件退回处理程序，但尚未调用（根据日志）。
Maybe it'll be invoked after waiting 24-48 hours. 也许它会在等待24-48小时后被调用。 Let's see. 让我们来看看。
Set up account with email simplename@gmail.com and exactly the same thing (ie, nothing) happened when I invoked Forgot password functionality. 使用电子邮件simplename@gmail.com设置帐户，并在调用忘记密码功能时完全相同（即，没有）。
Changed sender email to admin@project-name.appspotmail.com (instead of project-id ) and got an Unauthorized sender message in an exception. 将发件人电子邮件更改为admin@project-name.appspotmail.com （而不是project-id ），并在异常中收到未经授权的发件人邮件。
This means that the other addresses I have tried have been authorized senders as I never saw this exception with them. 这意味着我尝试过的其他地址都是授权发件人，因为我从来没有看到过它们的例外情况。

1 个解决方案

The best way to troubleshoot App Engine Email delivery problems is to Configure Email Bounce Notification . 解决App Engine电子邮件传递问题的最佳方法是配置电子邮件退回通知。 As Emails are delivered asynchronously, any delivery problems will result in a bounce to the specified sender. 由于电子邮件是异步传递的，因此任何传递问题都会导致指定发件人退回。