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copied!<p>You can either have a program that runs constantly and has a timer or a loop that checks the time of day and then sleeps for a really long time and when the timer goes off or it's the right time of day it sends an email, or you can launch a program as a scheduled task. The first method can also be implemented as a service if you would like. Keep in mind you dont need ASP.Net to send emails, all you need is a console application that uses System.Net.Mail. Check out the mailer sample on MSDN for a very simple idea. </p> <p>One other thing you can consider: IIS has an smtp service that you can install and it uses a pickup directory to send mail. You write an email to the pickup directory as an .eml file and IIS grabs it and sends it almost immediately. If you do that, you'll still have to write the emails (System.net.Mail will write the .eml files from a MailMessage, just set SmtpClient.DeliveryMethod to SpecifiedPickupDirectory or PickupDirectoryFromIIS and call SmtpClient.Send) but it will then send them for you. You'll still need to schedule something somehow so this might not be all that more useful but I thought I'd at least let you know that it exists. </p> <p>One thing to be aware of: when the IIS SMTP service reads the send envelope of the .eml file, the order of the Sender and From headers is significant; if the From header appears before the Sender header then the MAIL FROM command will use the From header, which is incorrect (and MS won't be fixing this one). This appears to be an issue ONLY with the IIS SMTP service as it hasn't been reported anywhere else that I'm aware of. Reversing the order of the headers is the work-around. By default SmtpClient always writes the From header first. I'm aware of the issue and IIS isn't fixing it but I may be able to get a fix into SmtpClient for the .NET 4.0 RC build that re-orders the headers for you but no promises. </p>

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