After monitoring the fix, we have verified that the issue is resolved. Sending via Single Sends and automation has been re-enabled and New Marketing Campaigns contact data is largely up-to-date. There may still be a very small subset of customers who are experiencing contact delays related to imports/updates performed during this outage. Our team will be addressing these delays this morning, however affected customers can perform their imports/updates again should they find they are not seeing contact related additions/changes performed during the outage. We apologize for any inconvenience this caused and appreciate your patience. Please reach out to our Support team at https://support.sendgrid.com
if you have any questions.