Bounces can be early indicators of larger reputation issues or bad list-building practices, and if you don’t take them seriously, ISPs will take notice-and might block your email altogether. If a mailbox provider sends you a bounce notification, it’s telling you that something is wrong and providing you with additional information to help fix that issue. How you handle bounces can have a serious impact on your email delivery and overall sender reputation. How email bounces impact your sender reputation and deliverability # Our SMTP Field Manual provides a directory of common bounce codes from popular mailbox providers and spam filters, along with actionable advice on how you should handle these bounce notifications. Not all bounce codes are as straightforward as the example above-but we’re here to help you make sense of them all. If the email address doesn’t exist, we should not attempt to send to it again. Thanks Gmail, that’s actually quite helpful. Please try double-checking the recipient's email address for typos or unnecessary spaces. Here’s an email bounce code example: smtp 550 5.1.1 The email account that you tried to reach does not exist. What’s handy about these SMTP responses is that they don’t just tell you there was a problem, but they also give you more detailed (and in some cases really helpful) information on why exactly your email delivery failed. Every response code consists of a numerical bounce code along with a description that provides more info on how the mail server uses that SMTP code. We’ll go into more detail on those different kinds of bounces in a moment. But if the receiving server couldn’t complete the delivery, it will respond with an error code.īounce error codes generally start with the number 4.X.X for temporary failures (soft bounces) and 5.X.X for permanent errors (hard bounces). For example, an SMTP response code 250 means the message was accepted and the delivery action was complete. What’s an email bounce code? #Įach time an email is sent using SMTP, the receiving server will respond with an SMTP code. And just like the post carrier uses stickers and stamps to categorize what went wrong with your letter, a mailserver may reject your email with a diagnostic bounce code. Picture an email bounce as the digital equivalent of this scenario. Have you ever mailed a package or a letter, but it got returned to you a couple of days later-maybe it even included a sticker that provided more information on why your item wasn’t delivered? It might be that the address didn’t exist, you didn’t include sufficient postage, or the recipient refused to accept the package. What happens to our digital messages isn’t too dissimilar from what happens when post carriers handle mail in the real world. When an email bounces, it didn’t make it to the recipient’s inbox-but instead, the mailbox provider returned it to the sender.
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