How to forward one email to two SMTP server using postfix?

## My Requirements I have two email servers, james and winmail. They hold same users, for example, account 1@example.com exists both in james and winmail. When someone sends a email to 1@example.com, I expect that both james and winmail receive that email, and the eml content should be exactly the same. ## My Attempts I tried to configure two MX in DNS. But it can only map example.com to james **or** winmail, not both. Then I try postfix, which means example.com resolved to postfix server, and when postfix receives the email, it should forward this email to james **and** winmail without saving it to local storage. However, /etc/postfix/transport only supports map example.com to one server too. So how can I make postfix forward every email to these two SMTP servers at the same time?