async function test() {

 let i = 0
 let userId = [5000, 1000, 7000]
 try {
    while (i < userId.length) {
        const userEmail = await getUserEmail(userId[i])
        let sendEmailResult = await postSendUserEmail(userEmail)
        i++
    }
 } catch (err) {
    console.log('Got error')
 }
}


(async () => {
 await test();
 // Do some logic here
 console.log('All  done')
})().catch(e => console.log(e));



function getUserEmail(milis) {
 return new Promise(function(resolve, reject) {
    if (milis == 1000) {

        setTimeout(() => {
            console.log('Rejecting millis', milis)
            return reject('Got error')
        }, milis);

    } else {

        setTimeout(() => {
            console.log('Processing millis', milis)
            return resolve(milis);
        }, milis);

    }
  })
}


function postSendUserEmail(milis) {
  return new Promise(function(resolve, reject) {
    if (milis == 1000) {

        setTimeout(() => {
            console.log('Rejecting  email', milis)
            return reject('Got email error')
        }, milis);

    } else {

        setTimeout(() => {
            console.log('Sending  email', milis)
            return resolve(milis);
        }, milis);

    }
})
}

async function test() {

    let i = 0
    let userId = [5000, 1000, 7000]
    try {
        while (i < userId.length) {
            handleUser(userId[i]);
            // const userEmail = await getUserEmail(userId[i])
            // let sendEmailResult = await postSendUserEmail(userEmail)
            i++
        }
    } catch (err) {
        console.log('Got error')
    }
}

async function handleUser(user) {
    const userEmail = await getUserEmail(user)
    let sendEmailResult = await postSendUserEmail(userEmail)
}

while (i < userId.length) {
      try {
        const userEmail = await getUserEmail(userId[i])
        let sendEmailResult = await postSendUserEmail(userEmail)
      } catch (err) {
        // err handling here
        // ....
     }
      // Need to do this regardless of whether or not error occured.
      i++
    }