Common Reasons for Email Bounce

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Soft Bounces are usually temporary and fall into three categories: Category bounces are most often due to full mailboxes, timeouts, or throttling. Emails with this designation are typically retried for up to hours ( for AOL), offering a chance for delivery upon resolving the issue. Category bounces stem from technical problems such as Transient Failures, Admin Failures, or DNS Failures. Like Category , these emails are retried for up to hours (or for AOL). Category bounces are the most elusive. These bounces have unknown, undetermined, or gibberish details. Emails falling under this category are also retried for up to hours ( for AOL) in the hope that the mystery might resolve itself.


Codes According to a study by how our database boosts your businessReturnPath, an average of % of all emails never reach the inbox—that’s out of emails! This makes understanding the reasons behind email bounce codes a critical skill for every email marketer. Let’s look at six common causes behind these unwelcome bounces: Invalid Recipient Address: This means that the email bounced back due to an invalid email address. This can be because of a typo or because the email account has been closed. Server Issues: Temporary issues with the recipient's server, like it is down or overloaded, can cause an email to bounce.


These are typically soft bounces, as the problem may be resolved, and the email could be delivered later. Message Size Exceeded: Emails have size limits, which include the message text and any attachments. If the email exceeds this limit, it will bounce back. Domain Not Found: If the domain of the recipient's email address doesn't exist, the email will bounce. This could be because of a typo in the domain or because the domain has been taken down. Content Filtering: Sometimes, an email will bounce back if the content of the email triggers spam filters.