If the recipient’s SMTP server does not respond, sendmail will recurrently send emails. The MTA will periodically send all the messages in queue until completion. We’ll touch upon the differences between these two terms in the next section. Most mail servers use a mail transfer agent (MTA) called sendmail to do the actual sending. Since you’re sending 100 emails, the SMTP server on your host puts them on a queue. The server, in turn, interacts with SMTP servers on the recipients’ hosts to relay the email. Your email client interacts with the SMTP server to send the message. Let’s say you’re launching an email campaign that contains 100 recipients. Usually, the SMTP server starts from the beginning of the queue and goes forward. Once the emails have been enqueued, they’re delivered step by step. The communication between the sender and the recipient is asynchronous. At the same time, the sender does not need to send each message separately. You can look at an email queue as a buffer where the emails are stored before they hit the endpoint. As such, the queued emails wait for processing until the recipient is available to receive them. It allows them to communicate without being connected. An email queue decouples the sender from the recipient. A message queue is meant to decouple a producing process from a consuming one. Email queuing is a form of Message Queuing – an asynchronous communication service-to-service. It is a system that creates an array of emails that are waiting to be processed for delivery. What is an email queue?Īn email queue is a mandatory component of SMTP servers. Here, we’ll figure out why you would opt for email queueing in your app, and how this can be done. ![]() When the recipient is able to receive email, they are sent. Emails are put on an SMTP queue that provides temporary storage before processing. But when you deal with transactional emails or bulk mails in your app, they can’t all be sent at the same time. When you send one email, a sender interacts with a recipient at the same time.
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