我在一家网络公司工作，该公司每天发送大量电子邮件（状态更新、通知等）。目前，我们通过第三部分来完成这项工作，但由于服务存在一些问题，我们正在考虑自己发送电子邮件。
我们知道，我们目前使用的服务在其系统中有几个限制，即发送电子邮件的速度和每天发送的数量，大概是为了避免垃圾邮件分类。我们对自己发送电子邮件最大的担忧是确保我们自己不会超过这些限制。
So on to the question: When setting up an email service meant to send large amounts of emails, what should we keep in mind? Are there any general limitations save those by our ISP as to how many emails you can send before someone somewhere starts considering you a spammer? What are the risks we would take with doing it ourselves instead of using a third party service (save server errors and the "normal" risks with hosting things)? Should we throttle the sending rate? Etc.
Or a very condensed version of the question: What to think about when setting up a service to send a lot of emails yourself?
当然，我们也在考虑其他第三方服务，但我们希望能够权衡各种选择。