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Update bounce qualification after an ISP outage update-bounce-qualification.md

Context

In case of an outage of an ISP, emails sent through Campaign cannot be successfully delivered to their recipient: these emails will be wrongly marked as bounces.

In December 2020, a global issue at Gmail resulted in some email messages sent to valid Gmail email addresses being incorrectly hard bounced as invalid email addresses by Gmail servers with the bounce following response: “550-5.1.1 The email account that you tried to reach does not exist.”

Google has stated that the Gmail outages and disruptions that caused this issue started on December 14th at 6:55AM and ended at 6:09PM EST on December 15th. Our data analysis also showed a very short spike in Gmail bounces at 2:06AM EST on December 16th, with the majority occurring on December 15th between 2:00 pm EST and 6:30 pm EST.

Per standard bounce handling logic, �۶���Ƶ Campaign automatically added these recipients to the quarantine list with a Status setting of Quarantine. To correct this, you need to update your quarantine table in Campaign by finding and removing these recipients, or changing their Status to Valid so that the nightly clean-up workflow will remove them.

To find the recipients who were affected by this Gmail issue, or in case this happens again with any other ISP, please see the instructions below.

Process to update

You will need to run a query on your quarantine table to filter out all Gmail (or other ISP) recipients who were potentially affected by the outage so they can be removed from the quarantine list, and included in future Campaign email deliveries.

Based on the timeframe of the incident, below are the recommended guidelines for this query.

For Campaign instances with SMTP bounce response information in the Error text field of the quarantine list:

Once you have the list of affected recipients, you can either set them to a status of Valid so they will be removed from the quarantine list by the Database cleanup workflow, or just delete them from the table.

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