All email list administrators know what they look like, but what do they mean? Some bounces seem to have a clear meaning, but others are cryptic enough to make any normal person tear their hair out. The way bounce codes look when they show up is not even consistent!
Sometimes they'll look like this:
Remote-MTA: dns; smtp.myemail.com [192.0.2.3]
Diagnostic-Code: smtp; 550 No such user here
Other times you'll see something like this:
while talking to smtp.store.example [192.0.2.3]
>>> RCPT TO:< This email address is being protected from spambots. You need JavaScript enabled to view it. >
<<< 550 No such user here
Okay. Take a step back, a deep breath and relax.
You can safely ignore most of what you see in both messages. The important part of the message is the 3 digit numerical code, 550 and the short description that follows immediately.
What do those three digit bounce codes mean? Well here's a list of the codes that matter to a mailing list manager and what they are supposed to mean:
- 550 - The requested command failed because the user’s mailbox was unavailable (such as not found)
- 551 - The recipient is not local to the server.
- 552 - The action was aborted due to exceeded storage allocation.
- 553 - The command was aborted because the mailbox name is invalid.
- 554 - The transaction failed for some unstated reason.
The code to worry about for email marketers is code 550. Usually this means that there is no mailbox for that address. At this point you would want to cull the address from your list to avoid wasting resources on mailings, but even a code 552 which means that the user has exceeded their storage allocation is important. If the mailbox is full for several mailings it might be best to remove the address from the list.
Bounce codes are a great tool for refining lists gor maximum efficiency. If you have any questions about bounce codes or about how we can help you manage your email marketing please contact us.
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Asked by Lorrain, 'I’m not allowed to tell you' agency
Before any marketer should worry about their overall click through rates, they should first concentrate on their open to click through rates (number of unique clicks/number of unique opens). This stat reveals a lot about your content relevancy, value and creativeness. If your open to click through rate is high but your overall unique click through rate is low, you’re in a much better position than if both stats are low. Assuming your sender reputation is stellar, the reason for this is that it shows the subscribers opening your email find the content relevant and engaging. More importantly, to get additional subscribers to open your email is more of a less costly function of creating compelling and enticing subject lines. With both open to click through rates and unique click through rates low your problem is much bigger. The issues can range from poor email design to content value. From a design standpoint I find that B2C marketers think what works on the web will work in email and from B2B marketers they think what works in direct mail will also work in email. Just as the same rules don’t apply to newspapers and radio the same is true in crossing online mediums.
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