SMTPServer Multiple Mail Message Performance

I am creating a mass mailer web app. I was wondering if there was a big
performance difference between adding all of the email addresses to the
mailmessage Bcc property or simply sending a new mail message for each
recipient.
The reason I ask if because I want to be able to add a link with the
Recipient ID as a query string parameter for people to unsubscribe from
the list.
Only way I see of doing this is to send each email separately.
Thanks in advance for any help with this.Or create a page where they can enter their email address to be removed...
"SirPyros" <SirPyros@.hotmail.com> wrote in message
news:1122468164.699006.104580@.g14g2000cwa.googlegroups.com...
>I am creating a mass mailer web app. I was wondering if there was a big
> performance difference between adding all of the email addresses to the
> mailmessage Bcc property or simply sending a new mail message for each
> recipient.
> The reason I ask if because I want to be able to add a link with the
> Recipient ID as a query string parameter for people to unsubscribe from
> the list.
> Only way I see of doing this is to send each email separately.
> Thanks in advance for any help with this.
>