Mail trigger to multiple members

No, with system.net (gmail), you can't send 1000 mails at a time , however it depends on server as well for example if your website is hosted on godaddy server and uses their mailing system then you need to use

"relay-hosting.secureserver.net" port="25" />

and it may allow you to send 10k mails at a time.

Ramachandran M5y ago

Thanks for your reply sachin.. Due to cost issue client refused the proposal. Any possiblity to send via C# ?

Sachin Singh5y ago

For sending 10k or more emails at a time you have to use an Email Service Provider(ESP). And there are end number of ESPs that offers you to send thousands of emails at a time.

read here which are currently in market

https://www.guru99.com/bulk-email-services.html