Suppressing Mailbox Full bounces too soon is all but guaranteed to suppress active users who are likely to open in the near future, but continuing to send to them could also damage your sender reputation. Further analysis of the data supports that assertion, especially for the Big 3 providers. In the last article, we advised senders to avoid the urge to suppress Mailbox Full bounces after a single occurrence. Week One saw around 8.7% openers - better than Gmail and the overall average - but at one year, just over 29% had opened. Since bounce-handling methodology can vary pretty widely across the remainder of the mailbox providers, we lumped them together for our final analysis. The ‘Big 3’ providers may make up the bulk of your list, but there are still lots of other domains out there that you need to successfully reach. An impressive 30% of the bounced recipients opened a message within a week, and over 75% engaged within a year of the bounce. It may take an astronomical amount of mail to fill a VMG inbox, but VMG recipients who bounced with Mailbox Full were much more likely than others to correct the situation quickly. We saw only a few thousand Mailbox Full bounces during our research period, a fraction of what we found for Gmail and Microsoft domains. With that much storage, how often could their recipients possibly have a full inbox?Īccording to the data, not often. Verizon Media Group (Yahoo/AOL)Īlthough Gmail was the first to increase email storage space, VMG currently leads the free storage pack with a whopping 1TB of email storage provided free to all recipients. For what it’s worth, our outbound data indicates still gets the highest volume of mail of any Microsoft domain (by far). My theory is that many of these are “O.G.” Hotmail users who have years’ worth of saved-up email, but still use their accounts regularly. A week after the bounce, over 15% of the recipients had opened another message a year later, that number was over 50%. Somewhat surprisingly, Microsoft recipients were even more likely to respond after a Mailbox Full bounce. Like Gmail, Microsoft provides 15GB of free email storage for all users, so should we expect to see similar results? Let’s look at the data. Even so, almost 40% of Gmail recipients with a Mailbox Full bounce opened another email within the next 12 months. Given Gmail’s bountiful free email storage, industry advice often asserts a full mailbox there is likely to have been abandoned. By one year, though, the percentage of recipients who opened after Mailbox Full had risen to over 38.5%. Our data set included millions of Mailbox Full bounces from Gmail recipients - but how many of those addresses were likely to re-engage later?Īfter seven days, just shy of 8% had opened a subsequent email - not far off from what we saw in the original results. Since Gmail makes up the majority of the average marketer’s list, we placed a special focus on their data. Rumors have also been swirling of Gmail making changes to the way they handle Mailbox Full bounces, so we thought a deeper analysis of the results by ISP was in order. The surprising results sparked conversation in the industry, with senders and providers debating how to handle Mailbox Full bounces in light of the data. One of our most notable findings pertained to Mailbox Full bounces - specifically, that almost ⅓ of recipients with a Mailbox Full bounce opened another message within the next 12 months. A few weeks ago, we shared our research on different types of bounces and their implications for senders.
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