通过 Gmail SMTP 可靠地发送电子邮件
我有一个通过 smtp.gmail.com 发送电子邮件的 C# 应用程序。如果我发送了大约 20 封电子邮件，我就会开始收到这样的错误：
The server response was: 4.7.0 Temporary System Problem. Try again later (WS)
通常，20 封邮件中大约有 17 封最终会被发送。
请注意，我并不是说发送了 20 条消息，但只有 17 条消息成功发送，我的意思是实际上只有 17 条消息尝试发送。
我找不到有关此错误的更多具体信息，但我认为这与某种 gmail 限制有关，因为如果我一次只发送 1-5 封电子邮件，我就不会看到此错误。
有人可以确认这意味着什么以及为什么会发生吗？
I have a C# application that sends emails through smtp.gmail.com. If I ever send about 20 emails, I start getting errors like
The server response was: 4.7.0 Temporary System Problem. Try again later (WS)
Usually, about 17 messages out of 20 ever end up getting sent.
Note that I am not saying 20 messages were sent and only 17 were successfully delivered, I mean that only 17 actually even try to get sent.
I can't find much specific info on this error, but I assume this is related to some kind of a gmail throttling limit, because I don't see this error if I only send like 1-5 emails at a time.
Can someone confirm what this means and why it happens?
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