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Haipt

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How to send mail to thousand recipient at one time

Hi experts!

 My company has thousands of students, poolers.Almost of them use free mail  , so we can not send mail to all of them at one time  using micrsoft exchange .Now , I  have to write a tool to send mail  to alll of them by the following way :
 - I separate the address in to many small part  and send each part every 30 minutes .
This work but it make me hard working... do you know real free tool  do this similar task or a tip, trich to send thousand recipents at one time in .NET ?
 Thanks!
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lenamtl
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Haipt

ASKER

Could you show me the limitation or qouta of some free mail such as : gmail , yahoo ?
eg : maximum message per day , maximum recipients at one time , max recipient per day..
Thanks you !
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ASKER

Not a complete solution but very good!