I have been trying to figure this ou but it looks like comcast/xfinity has blocked ip addresses on its own network from receiving email. As of a few days ago I am unable to use Outlook, or even a third party program that I have that sits in the tray and alerts me if I have mail. When I looked at the logs I see that the IP that I get from comcast is blocked.
PopCmdSent: PASS ****
PopCmdResp: -ERR [AUTH] Your IP is on a blocklist, for more details please go to https://www.spamhaus.org/query/ip/18.104.22.168
POP3 response indicates failure.
PASS_response: -ERR [AUTH] Your IP is on a blocklist, for more details please go to https://www.spamhaus.org/query/ip/22.214.171.124
POP3 authentication failed
Please dont post any nonsense about clearing out the cache or use a different browser. On a side note, I can access email using the webmail interface but its not what I want to use.
If you follow the CBL lookup link on that page, it says:
RESULTS OF LOOKUP[more]
126.96.36.199 is listed
This IP address was detected and listed 2 times in the past 28 days, and 0 times in the past 24 hours. The most recent detection was at Tue Oct 1 01:45:00 2019 UTC +/- 5 minutes
The IP Address (188.8.131.52) is infected with or NATting for a computer infected by the Gozi botnet. Gozi is also known as Ursnif, Snifula and Papras.
You'll need to clean up your system, or persuade Spamhaus that it isn't dirty.