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Infinite Loop email Program


stevepatd

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I have a program for a client where their users reserve a timeslot (appointment).  I would like to have the program send the user an email the day or two before the appointed time.  I don't want to have the administrator of this program go in and run a function to send emails, if any, every day.  I would like it to be automatic.  But the only way I see this happening is to write a program that is an infinite loop that may pause for many hours at a time and then wake up and check to see if any have to be sent out.

 

But then if the server ever goes down the program exits and someone would have to restart it.  How do I get a program to run in the background and send periodic emails when it is appropriate?

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