发送电子邮件后,我可以获得多少有关其进度的信息?
我正在为我的应用程序设计一种发送电子邮件的功能。
我想知道,一旦我发出电子邮件,是否有办法查明
- 电子邮件地址是否存在以及是否真实,
- 如果未收到电子邮件
- ,则问题出在哪里? (邮箱已满,电子邮件 地址 无效等)
- 电子邮件已被阅读(可能要求太多 但 那就太好了)
我能得到任何反馈吗?
我使用 .NET 框架中的 SMTPClient 来执行此操作。
I'm designing a capability to send emails out for my app.
I was wondering once I send out an email, is there anyway to find out whether
- the email address exists and is real
- the email was received
- if not received, what the problem was? (mailbox full, email
address
invalid etc.) - the email was read (probably asking too much
but
would be good)
Do I get any feedback at all?
I'm using the SMTPClient in the .NET framework to do this.
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不。您可以查明目标服务器是否接受该地址。但您无法查明该帐户是否真实存在。即使服务器接受该地址,它也可能稍后被退回。
不。如果您没有收到退回邮件,则必须假设它已送达。没有任何保证。它可能已进入垃圾邮件箱等。
如果未收到邮件,您要么收到退回邮件(或者根据发送邮件的方式,在将邮件发送到目标服务器时,直接在 smtp 事务中收到错误) )。
不。您可以请求阅读回执或做一些奇特的事情,例如嵌入外部跟踪器图像的链接。但所有这些东西通常默认情况下都会被阻止。
no. You can find out if the target server accepts the address. but you can not find out if the account really exists. even if the server accepts the address it could be bounced later.
no. if you don't get a bounce, you have to assume it was delivered. there is no guarantee. it could have landed in a spam box etc.
if a mail is not received you either get a bounce message (or depending on how you send the message you get the error directly in the smtp transaction while sending it to the target server).
no. you can request a read-receipt or do fancy stuff like embedding links to external tracker images. but all this stuff is usually blocked by default.