If the sender is unable to deliver it queues up the email and attempt to send it again after a few days. Solution: The sender's email server will keep on retrying for a few times and pass on further details back to the sender's server. 441 4.4.1 Error when sending an emailĮrror Reason: Network is busy! This error states that an email sent to the recipient's email provider was not able to respond to the sender's request. In the world of SMTP, hard bounces are those emails which can never be delivered, and soft bounces are those emails which couldn't be delivered, but you can try after some time. Let us make it clear that 5xx = Hard bounce and 4xx = Soft Bounce. Bounce Error Codes and Fixesīefore moving forward with Error code and fixes. You can find more at SMTP Error Code library. In this section, you will learn deeply about 4xx - Persistent temporary failure and 5xx - Permanent errors. These email servers send out a command like HELO, EHLO, MAIL FROM, DATA and in response receives three-digit code as shown below.Ībove are just a small representation for error codes.
These response codes are the only ways in which email servers communicate over a network. SMTP response codes are the primary source for debugging issues related to bounce. So, it's important to choose the right ESP who has the right set of algorithms to catch these bounces in real-time. So, either you have to learn these codes, and write programs to handle those or rely on an email service provider like Pepipost, who have already written systems and processes to manage all these bounces for you proactively.Īlmost all ESPs flow their own protocol to interpret these bounces and act. When it comes to campaigns, practically it won't be scalable enough.Įach bounce back message contains an SMTP error codes and its descriptions. I would say NO! why? Because this interpretation is possible if you are talking about 1-1 or 1-few emails. So, you might be thinking then it's pretty easy to read that message and fix the problem. These segregations help you in removing the unwanted hard bounced email addresses which don't exist at all.Įvery bounce back emails have a message explaining the reason for the bounce. Usually, these bounces can be one of that Soft bounce or Hard bounce. So, let's assume that out of total list about 40% of emails got bounced due to invalid email addresses, then how you will debug those? When you talk about sending out an email campaign, it is not for few email addresses, right? The list can have any numbers of email addresses from thousands to millions depending on your customer base.
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