There was an Email Service Impact Incident report that went out from Gainsight today which I have copied below. We did not see any issues for the emails that went out the morning of Jan 17 and 18 but this morning we have about double the number of email bounces than usual. The previous time this occurred Gainsight Support instructed us to use Email Validator to remove emails from blacklist that had proofpoint in the error message then resend the emails. You can reach out to Support to confirm if you should take the same steps if you find this to be the issue. Here is Incident report:
New Incident Status: Monitoring
We have identified higher bounce rates on emails sent using
Gainsight Email Services (CoPilot/Cockpit) for some customers that have
recipients using Proofpoint for Mail Security (Dynamic Reputation). The root
cause was identified to be a false positive in blacklisting of an IP address
at Proofpoint and is now resolved.
Some of the emails sent between January 17th and 18th might have bounced and may require customers to resend.
Please contact email@example.com if you have any questions.