Keelvar use Mandrill as a sub vendor to send transactional emails for Keelvar's Sourcing optimizer. Bidder invitation emails, password reset emails, notification emails are some examples that Mandrill send on our behalf. We have been notified by Mandrill that they have encountered serious issues "affecting up to 20% of [Mandrill] outbound volume as well as a majority of inbound email and webhooks."
While Keelvar have not identified any failed emails to date, there is potential for intermittent problems in sending or updating the status of an email. Keelvar are monitoring the situation while Mandrill work towards rectifying it.
Further details can be found here: Important information about an ongoing mandrill outage
Mandrill has confirm issue has been resolved. Overall impact to Sourcing Optimizer users has been minimal.