An ongoing issue at Gmail is preventing emails from all Kinsta services from being delivered. Affected systems include but are not limited to:
MyKinsta Emails, Support Emails, Affiliate Emails.
Additionally, we are seeing that customers are affected by this as well on their own sites with outgoing emails to Gmail's service being undeliverable. Several service providers are reporting similar issues.
More information can be found at the Google Workspace Status Dashboard at https://www.google.com/appsstatus#hl=en&v=issue&sid=1&iid=a8b67908fadee664c68c240ff9f529ab