Outbound emails are not being sent from 3rd party applications (iOS Mail, MS-Outlook). The emails stay in the Outbox, with the following error messages: "resomta-po-15v.sys.comcast.net resomta-po-15v.sys.comcast.net CSI IP __________ is not permitted to send messages. Please contact support if you feel this is in error" and "The smtp.comcast.net server is not responding." The problem surfaced one week ago, and has persisted except for an approximate one hour period on Thursday when it worked normally.
Comcast Customer Security Assurance tier 2 recommended using the Xfinity Connect app. However same problem is occurring with the following error message, "Your email failed to send and has been saved to the Drafts folder."
Can you PM me the IP address? also, are you by chance using a VPN when trying to send?