Helpless in Massachusetts.....
I have 5 comcast accounts (various ones all ending in comcast.net)
Side Note: I was with Comcast, now with Verizon for my home internet provider.
All 5 accounts are having the same problem.
We can focus on one: rwdy2
a. I have all 5 accounts on my iphone - when I use the iphone default mail and on my ATT wireless service, I am able to receive and send mail on all 5 accounts.
b. When I switch to my Verizon wifi at home, I can receive mail but cannot send
c. I use Outlook (full version 2016) on my laptop. None of the comcast accounts send mail but I can receive on all of them.
The error message I get when trying to send mail is the following:
Task 'email@example.com' - sending 'reported error (0x800CCC67): 'the server responded: 421 resomta-ch2-19v.sys.comcast.net resomta-ch2-19v.sys.comcast.net CSI IP 188.8.131.52 is not permitted to send messages. Please contact support if you feel this is in error.'
I have reached out to the Post Master and put in a block list removal - the response back was that the IP address 184.108.40.206 is not blocked. This IP address being mentioned is a Verizon modem/router IP address.
This is their exact response: "We need the IP address currently blocked to further investigate this issue. The IP address is a number separated by decimals and is located in an error code starting with "550" in the returned email from Comcast." I don't have this.
Update: I tried to delete the rwdy2 account to reinstall it and now it will not reinstall - I keep getting a message that "something went wrong" and Outlook will not set up the account nor can I get it set up using the control panel/email accounts. I am reluctant to delete any other .comcast accounts because atleast now I am able to receive on them.
Just a quick update:
I was able to set up the rwdy2 email account under User Accounts/Mail (Microsoft Outlook 2016) but a test message was unable to be sent.
The same error message is happening that I logged before.