PHPLIST - HAProxy - Postfix cluster. Data transfer

Hi All,
We are planning to implement PHPLIST–HAProxy-Postfix cluster to handle heavy load. We want to reduce data transfer between phplist —> HAproxy and HAproxy–Postfix cluster.

If we send individual message we are breaching data transfer limit set on our server by the service provider. Postfix can handle any load and bandwidth.

Is it possible to send single message with multiple recipients?

Any help is appreciated.

Thank you

No, phplist sends to only one recipient.