Over the last month or so I have been experiencing an intermittent problem with my outgoing email (I use Thunderbird). I have to turn off my VPN (Private Internet Access) to get the email client to work. This does not happen all of the time and I have just recently been experiencing this specific error with outgoing email. As a temporary solution, since it seems to be the VPN servers that are causing the problem, I disconnect the VPN and I can then send email. I am using the Comcast email servers for my SMTP service.
The error message (which appears when I attempt to connect using Thunderbird) is:
Sending of password for user XXX@comcast.net did not succeed. Mail server mail.comcast.net responded: Your IP is on a blocklist, for more details please go to https://www.spamhaus.org/query/ip/188.8.131.52
When I visited Spamous and entered the IP, it reported that "...184.108.40.206 is listed in the XBL, because it appears in: CBL Lookup..." (whatever that means)
I also got this message:
Sending of password for user email@example.com did not succeed. Mail server mail.comcast.net responded: Your IP is on a blocklist, for more details please go to https://www.spamhaus.org/query/ip/220.127.116.11
Again, I checked the Spamhous site and it reported, however, that the IP address was NOT included in the SBL, PBL, nor XBL (whatever they are). I assume that this means that Spamhous doesn't have a good reason for whey the IP was blocked.
I include the details about the Spamhous in case that helps with resolving the issue.
Any ideas how this can be resolved?
@aluminum i've sent you a PM