Hi folks, sorry if this is terse, but wanted to post something to our blog asap:
We’re in the midst of upgrading our servers. The goal is to help make things nice and fast and stable for all the holiday traffic we’re expecting for our senders.
Unfortunately, it looks like there may be certain scenarios where relatively complex segmentation queries caused us to send out duplicate emails. This is obviously something that’s potentially extremely embarrassing for us, but more embarrassing for our customers, so we wanted to get this apology posted for you to link to in case this affected your campaign. As of right now, we’ve only seen one report of this happening (but in a big way, unfortunately), so we’re scanning the system to see if there are more cases of this. If you don’t send campaigns that use relatively complex segmentation queries for different interest groups, there’s nothing to worry about. If this affected your list, please let our support know. They have authority to make this right for you. If you’re a subscriber who received duplicate emails, we’re extremely sorry about that.