时事通讯缓慢发送 - 每小时2封邮件到同一服务器/最大电子邮件之间的延迟？

I have to make a newsletter sending utility application which will collect the list of subscriber from our central database and send out the newsletter. I've considered the possibility to be blacklisted due to flooding if I just flush out all emails at once, so I decided to go on a desktop-based softwer which will email those slowly.I have to make a newsletter sending utility app