Meteor JS: "Mail not sent; to enable sending, set the MAIL_URL environment variable" - meteor

Question

I am getting the following mail error:
"Mail not sent; to enable sending, set the MAIL_URL environment variable."
Not sure why. Please help. I double checked and the mail servers are fine. Tried as well everthing from meteor site:
https://docs.meteor.com/environment-variables.html#MAIL-URL
But still getting the error.
My code is in server folder and this is the config.js file:
AWS.config.update({
accessKeyId: Meteor.settings.private.s3Settings.awsAccessKeyId,
secretAccessKey: Meteor.settings.private.s3Settings.awsSecretKey,
});
STS = new AWS.STS();
S3 = new AWS.S3();
Mailer.config({
from: 'export#INSIDEDOMAIN.com',
replyTo: 'export#INSIDEDOMAIN.com',
addRoutes: false
});
Meteor.startup(() => {
Mailer.init({
templates: Templates
});
if (Meteor.isProduction) {
process.env.MAIL_URL = 'smtp://export%40INSIDEDOMAIN.com:INSIDEPASS#mail.INSIDEDOMAIN.com:465/';
}
Meteor.call('check_users_trial', function(err) {
if (err) {
console.log(err);
}
});
});
SyncedCron.start();
Meteor.methods({
check_users_trial: function() {
function checkSubscriptions() {
const fromDate = new Date(new Date().setDate(new Date().getDate() - 15)),
toDate = new Date(new Date().setDate(new Date().getDate() - 13));
const users = Accounts.users.find({
'profile.isSubscribed': false,
'profile.warningEmailSent': false,
createdAt: {
$gt: fromDate,
$lt: toDate
},
roles: {
$ne: 'admin'
}
});
users.forEach(function(user) {
if (!user.profile.isSubscribed) {
let isSubscriptionValid = false;
const today = new Date();
const registerDate = new Date(user.createdAt);
const checkDate = registerDate.setDate(registerDate.getDate() + 14);
if (checkDate > today.getTime()) {
isSubscriptionValid = true;
}
if (!isSubscriptionValid) {
Meteor.call('send_warining_email_trial', user.emails[0].address, function(error) {
if (error) {
console.log(error);
} else {
Accounts.users.update({
_id: user._id
}, {
$set: {
'profile.warningEmailSent': true
}
});
}
});
}
}
});
}
SyncedCron.add({
name: 'Send emails to users, whose trial period ended.',
schedule: function(parser) {
return parser.text('every 1 hours');
},
job: function() {
checkSubscriptions();
}
});
}
});

Answer 1

process.env.MAIL_URL is set only after startup() finishes, which is too late.
Move the following lines
if (Meteor.isProduction) {
process.env.MAIL_URL = 'smtp://export%40INSIDEDOMAIN.com:INSIDEPASS#mail.INSIDEDOMAIN.com:465/';
}
above your Meteor.startup call. And make sure isProduction is, in fact, true, otherwise that code will not execute.