In this case, you need to unlist yourself and optimize your email campaign. If it’s stuck, there could be different reasons including the blockage of your IP address. Your email campaign is being observed and assessed. Don’t panic! The filters will let the emails gradually pass to analyze how the rest of the recipients react to the message. Also, it’s advised to opt for a dedicated IP address instead of a shared option to maximize the speed of your email flow.Īnother common reason is that your email has been busted by spam filters. You can read more about SMTP commands and response codes in our blog post. Whenever an IP exceeds the limit of emails, the SMTP server replies with an error code (for example, 421) to any command. The only solution is to contact the incoming server as frequently as possible to push the queue. You may also reach the maximum email attachment size, which can be a brake factor as well. If you exceeded this rate and queued too many emails, the delivery speed will decrease. The limits are based on the sender reputation. Some mailbox providers (mostly the major ones like Gmail or Yahoo) enforce email rate limits on IP addresses. And here are the two core reasons for that: They’ll be sent anyway, but the time of the delivery can be significantly reduced. At the same time, queued emails can become an issue when they are waiting to be sent for an abnormally long time (depends on the service you use). It is a regular process that is quite beneficial for email campaigns. They are sent one by one from this buffer. When doing mass mailing, the SMTP server puts your outgoing messages automatically into an email queue. Why email queues get clogged and how to fix that – A mail transfer agent or MTA is a specific type of software that queues email and moves it along a delivery chain until it hits a Mail Delivery Agent (MDA). That’s where email queuing is mostly implemented. – An SMTP server is the part of the mail server that handles outgoing mail. For the difference between email protocols, reference the blog post: SMTP vs. – A mail server a computer system that sends and receives electronic messages using email protocols. What is the difference between a mail server, SMTP server, and mail transfer agent? If the sendmail queue fails to be delivered during a specific term (for example, five days), the email will be returned. Usually, your mail client will be notified about this sort of problem. In this case, the email queue turns into the sendmail queue. 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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