Email class

[eluser]Unknown[/eluser]
Hi i am php developer i need to code a script to send a mail to many address.
I found the email class of codeigniter.My question is how many address can i add to this
line of code?

$this->email->to('[email protected], [email protected], [email protected]');

there is a limit of address or i can add for example 20.000 address if i need it.

thank you for your help.

Bye.