Send Multipe Emails Using Nodemailer And Gmail

I am trying to send an email to multiple recipients ( about 3.000 ). All emails are stored in my DB ( Mongo ). So I make a query that return all the email addresses, and I use asyn

Solution 1:

It is because you are attempting to create a new smtp connection for each email. You need to use SMTP pool. Pooled smtp is mostly useful when you have a large number of messages that you want to send in batches or your provider allows you to only use a small amount of parallel connections.

consttransporter=nodemailer.createTransport(smtpTransport({host:'smtp.gmail.com',port:465,pool:true,//Thisisthefieldyouneedtoaddsecure:true,auth: {
    user:senderMail,
    pass:senderMailPassword
}

}));

You can close the pool as

transporter.close();

Solution 2:

From Gmail : 421 SMTP Server error: too many concurrent sessions

You may handle your send differently :

• wait to close the session between each sending

• send by bunch of mail

The best way is to manage to not exceed the limit of 10 session in the same time :)