ASP.NET - How to Send mail to multiple recipients at once in asp.net

i send mail using loop so, mail is sent one by one , i want all mail should be sent at once. is is possible ??

Nope.

Also, if you are using your own mail server for bulk emailing newsletters, be very, very careful on the amount of volume you send out at once and how much in any given day.  It is very easy to get your mail server blacklisted by the major carriers (gmail, yahoo, Microsoft, etc...).  Then, it won't matter how you send the email.  No one will ever receive it.

thank's for reply