Our business sends a newsletter to a vast number of subscribers every week. When the business was very young, before I joined, they used a "free" version of some mass mailer that took six hours to send 5K mails and fell foul of every reverse DNS check on the internet.Our business sends a newsletter to a vast numbe
阅读背景：
与.Net中的IIS SMTP服务器进行有意义的交互
来源：互联网
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