Task 'XXXXX@comcast.net - Sending' reported error (0x800CCC67) : ' The server responded: 421 resomta-ch2-20v.sys.comcast.net resomta-ch2-20v.sys.comcast.net CSI IP 173.239.XXX.X is not permitted to send messages. Please contact support if you feel this is in error. http://postmaster.comcast.net/smtp-error-codes.php#BL000010'
Re: Email wont send from outlook.exe when using VPN.
Thanks. Turned out to be a third party block by a company xfinity contracts with. Someone previously had used that VPN IP to send massive amounts of spam. When asked, they lifted the block, and it resumed working again.