The idea behind POP3 email
Mark Goodall - ATL - tooljunkie
>POP3 emails boxes, unlike MS-Exchange, are not really designed to store email for very long, they are designed to hold email for you only until Outlook downloads it. In a perfect world you are connected 24x7 and Outlook gets new email at least one every 60 minutes, so POP3 email boxes don't have to be very large at all.
Most POP3 email boxes are about 10MB in size, if you are receiving more than 10MB in an hour, then someone (not you) is using email for something it wasn't designed for... transferring large files. Most of the POP3 email accounts I adminster are 100MB, and even then, they can fill up if not used properly.
A few clinets of mine have one or two cronic attachment senders that are always clogging up their buinsess email boxes. What we do in those cases is setup two email boxes, one "business" box, and one "play" box and then ask those prankster pals who love to send those videos to the "play" account.
500 addresses is really quite a bit for a non-commercial endevour, and most ISP, even the larger commercial ones will block sending out that mainy email at once. Depending on your circumstance, sometimes a letter to the ISP explaining the valid need to send out that many is all that is necessary for them to allow you to send that many. I have several clients that have asked and been granted the ability to send that many at once. But you have to ask for it. These are business accoutns, so I doubt you'll have much success convincing a residentail ISP to allow you that. Also remember that by forcing you to use other methods, they are helping fuel other businesses. The email campaing companies like http://www.emaximation.com/ wouldn't stand a chance if the ISP let you do it for free.
Happy Woodworking!