resompta-po error

[sdc21]

An error occurred while sending mail: The mail server sent an incorrect greeting: resomta-po-10v.sys.comcast.net resomta-po-10v.sys.comcast.net CSI IP 173.239.236.2 is not permitted to send messages. Please contact support if you feel this is in error..

[bennu1]

I periodically get the same error message. Trying to figure out how to correct. Thanks

[bennu1]

I suspect it is from using a vpn but these days not using a vpn is like leaving the keys in a car.