My web application is hosted on IIS7. Google Apps has been working great for my SMTP needs. Now that I have a fairly large userbase along with a forum, there are many email notices being sent daily.
Google Apps has a limit on 500 emails per 24 hours per smtp user, which sometimes cause a conflict with my needs.
In an attempt to fix this, I created 4 google app users to rotate the load and set up an SQL job every 8 hours to change the HostSettings data for SMTPUsername.
Also I'm concerned about sending monthly newsletters now because I have about 40K users and obviously this is a nightmare to do with Google Apps.
I don't want to use SmarterMail provided by my ISP because google apps is very easy to administer.
Can you please give me a solution to overcome this? Whether relay SMTP server solves this?