Set maxMessages option to Infinity for the pooled SMTP transport.Pooled connections make it possible to bring this overhead to a minimum. You do not want to have the overhead of creating a new connection and doing the SMTP handshake dance for every single email. Use pooled SMTP by setting pool option to true (assuming you always send using the same credentials).Better to take the data from a queue when there’s a free spot in the connection pool (previously sent message returns its callback). for every message so it might be hard on memory if you pile up the data for 10 million messages at once. Nodemailer creates a callback function with related scopes etc. Use a dedicated queue manager, for example RabbitMQ for queueing the emails.Email might seem free but it is only free to a certain amount and that amount certainly does not include 10 million emails in a short period of time. Basically you get what you pay for and if you pay zero then your deliverability is near zero as well.
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Do not use services that offer SMTP as a sideline or for free (that’s Gmail or the SMTP of your homepage hosting company) to send bulk mail – you’ll hit all the hard limits immediately or get labelled as spammer. Here are some tips how to handle bulk mail, for example if you need to send 10 million messages at once.
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