Traditional SMTP bounce codes are three-digit numbers (e.g., 554) which indicate an email’s successful or unsuccessful delivery. If not, you’ll want to manually remove those addresses from your list, as hard bounces are a major red flag to the email clients and can affect your deliverability.

(For instance, at GMass, we automatically suppress your future messages to email addresses that have hard bounced.) Your email service provider may handle bounce management for you.

The general rule of thumb is to retry sending to addresses that soft bounce - and to stop trying to send to addresses that hard bounce on this campaign and in the future. For instance, the recipient’s mailbox no longer exists. Hard bounces are emails that bounce for a permanent reason. For instance, the recipient’s mailbox might be full or there might’ve been an error with their mail server. Soft bounces are emails that bounce for a temporary reason. The codes also shed light on the specific problem, which can range from the user having a full mailbox to an email account that no longer exists.

Email Bounce Codes: Takeaways and Next Stepsīounce codes are messages from a mail server to indicate why an email you sent was not able to be delivered.īounce codes indicate whether the failure was a “soft bounce” (meaning a temporary problem) or a “hard bounce” (meaning a permanent problem).

Bounce Management: How to Handle Email Addresses That Bounce.

In this article, we’ll cover everything you need to know about email bounce codes: What they are, how they’re determined, a list of the common (and not-so-common) bounce codes you might encounter, how to handle bounced emails, and ways to cut down on bounces. That can have a serious impact on your deliverability. (Or, at the very least, you’re not sending individual messages that people actually want.) If you bounce a significant number of messages, keep sending emails to an address that bounced, and/or repeatedly send email campaigns with bounces, you’re sending a signal to the email service providers and email clients you’re sending spam. When you send a message to a recipient and, for whatever reason, that message can’t be delivered, it bounces back to you.Īnd when that message does bounce back, the bounce notification will include a code telling you why it bounced. Bounces are an unfortunate but inevitable part of sending email (especially mass email).

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