Understanding sequential Promises with Bluebird Promise.each

Question

I want to send an array of messages sequentially (in the same order of the given array) to the Messenger Send API.

When I am sending two messages, like so:

import Promise from 'bluebird';

const message1 = {...};
const message2 = {...};

const send = (message) => {
    return () => {sendAPI.post('/', message)};
}

let promises = [ send(message1), send(message2) ];
Promise.each(promises, (promise) => {
    console.log(promise);
    return promise();
});

the messages arrive in random order, but the console.log(promise) returns the API calls in order? How can I sequentially send, using the Bluebird library, messages to the Messenger Send API?