[Mailman-Users] Roadrunner/TWC blocking Emails

Jayson Smith jaybird at bluegrasspals.com
Sat Jul 6 08:04:58 EDT 2019


I run a few Mailman lists, and yesterday evening I started having 
trouble sending Email to Roadrunner customers. I figured it was a 
temporary failure of some kind, until this morning when I received the 
same bounces. Whenever Sendmail connects to a Roadrunner Email server, 
it immediately gets this error:

    ----- Transcript of session follows -----
... while talking to dnvrco-cmedge01.email.rr.com.:
<<< 554 dnvrco-cmimta17 esmtp ESMTP server not available AUP#I-1000
... while talking to dnvrco-cmedge02.email.rr.com.:
<<< 554 dnvrco-cmimta14 esmtp ESMTP server not available AUP#I-1000
554 5.0.0 Service unavailable

Various attempts at Googling this error have lead me to believe that my 
IP may have been blacklisted by RR/TWC for some reason. Since the 
blocking happens immediately upon connect, my server doesn't have enough 
time to send enough information for RR/TWC to do an SPF check much less 
a DKIM validation. Various links I've tried to reach RR/TWC's postmaster 
site now lead to a Spectrum support page targeted at Spectrum customers 
having problems sending Email or receiving spam or other unwanted Email, 
not mail servers having problems sending into Spectrum/Roadrunner/TWC. 
Does anyone here know of an up-to-date link where I can find out if my 
IP is blacklisted by them, submit a removal request, etc?

Various RBL checking tools indicate I'm not on any blacklists, and 
several reputation check tools show my IP as being clean. I don't 
know—and probably never will—why Time Warner/Roadrunner would put me on 
their blacklist. This happened all of a sudden, a message addressed to 
two Roadrunner customers yesterday afternoon was accepted, then about 
five hours later they started blocking my IP.

Thanks for any help,


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