A municipal client needs to put in place a email delivery system which is capable of quickly alerting their users via email. We estimate about 10 alerts a day. Each alert will be sent to 1000 recipients.
The main issue is that the alerts need to be sent out in a timely and prompt manner. Any delay longer than two minutes will make moot the alert. To specify, the alerts would notify subscribers that their train will be arriving about 10 minutes late.
We've researched PowerMTA along with a few hosted services but the client prefers to use Exchange as their SMTP mailer.
Can Exchange and or IIS handle this? Is it true that Exchange uses the IIS SMTP service? If so, what's to be gained from using Exchange?