Comcast IP blacklisted by 1and1.com
We use smtp.w14c.comcast.net as the SMTP server for our email app (Thunderbird). Since yesterday (it was OK befor that) our emails to a few customers have been reject by their email server. Below is the content of the bounced message:
Final-recipient: rfc822; ***@exotech-info.fr
Diagnostic-Code: smtp; 554 For explanation visit http://postmaster.1and1.com/en/error-messages?ip=22.214.171.124
Last-attempt-Date: Thu, 11 Dec 2014 17:00:03 +0000
Apparently, "126.96.36.199" is blacklisted by their server. Please advice.