10:53 AM Mountain Time: As of this morning, https://calendly.com is being reported as a malicious link by Phishtank (one of the services we use to scan for phishing content).
The team has put some stop gaps in place to prevent further quarantines or deletions of emails containing these links, while we wait for more information on why these links are being considered malicious.
Please reach out with any questions to [email protected].