The utter hypocrasy of Comcast
I've recently moved (again) to a new dedicated server. Every time I do this I often have to contact the big ISP's (Yahoo, HotMail, etc.) to let them know that no, my machine is not a spam source, and to please remove any blocks they have.
So this server move was not really any different. I implemented DKIM as part of this server move and both Yahoo! and HotMail seem to like it better. HotMail still gives an error message:
Apr 13 21:27:51 habanero postfix/smtp[27966]: 82AEA10128A7: to=, relay=mx3.hotmail.com[65.54.244.72]:25, delay=0.89, delays=0.39/0/0.26/0.24, dsn=2.0.0, status=sent (250 mail from IP 64.85.172.185 soft failed sender ID check. Please ensure this IP is authorized to send mail on behalf of [xigole.com])
but the mail still gets through. Yahoo! and GMail are fine with it too.
But then there is Comcast...
Apr 13 21:04:52 habanero postfix/smtp[27910]: 7978E10128A5: to=, relay=mx1.comcast.net[76.96.62.116]:25, delay=93129, delays=93129/0.01/0.41/0, dsn=4.0.0, status=deferred (host mx1.comcast.net[76.96.62.116] refused to talk to me: 554 IMTA09.westchester.pa.mail.comcast.net comcast 64.85.172.185 found on one or more DNSBLs, see http://help.comcast.net/content/faq/BL001000)
If you go to that site you'll see that really it is Trend Micro having purchased mail-abuse.org. Apparently the company with
machines listed on Spamhaus and hundreds of customer machines sending spam:
Apr 13 17:48:44 habanero postfix/smtpd[27371]: NOQUEUE: reject: RCPT from c-68-40-28-136.hsd1.mi.comcast.net[68.40.28.136]: 554 5.7.1 Service unavailable; Client host [68.40.28.136] blocked using sbl-xbl.spamhaus.org; http://www.spamhaus.org/query/bl?ip=68.40.28.136; from= to= proto=ESMTP helo=
(one of hundreds I have in my mail logs) wants to block legitimate mail from legitimate sites. And if you try to contact the idiots at Trend Micro about the problem - nope, not your fix, you don't own the netblock. What idiots. My IP isn't listed on any RBL on the net but the dopes at Comcast and Trend Micro don't care about that - they have the "I'm a little boy with a big router and I like to pretend I know what I'm doing" mentality.
So I cancelled my subscription to the Trend Micro AV product and I will be damn sure to never switch my home ISP to Comcast. I can only hope you decide to do the same.
Posted at
09:39PM Apr 13, 2009
by Scott Dunbar in General |