nanog mailing list archives
Re: The block message is 521 DNSRBL: Blocked for abuse
From: Carlos Kamtha <kamtha () ak-labs net>
Date: Wed, 18 Sep 2013 20:38:08 -0400
Quite unfortunate.. These days, when allocated 'new' IPV4 space you really have to do a little homework to make sure it 'clean'. I would suggest that you run your CIDR block through http://multirbl.valli.org/lookup/. IF it's mostly clean and not on hardcore lists such as SpamHaus ROKSO, then there's hope. Whatever lists your netblock is on you will just have to contact thier abuse dept. and explain your predicament and stay on top of it. Sounds like you are well on your way to doing that.. Good luck. Carlos. On Wed, Sep 18, 2013 at 04:07:25PM +0000, NANOG wrote:
We recently purchased new IP addresses from ARIN, with plans on using one of them for our external and internal email delivery. We set up a reverse lookup and a SPF record for the newly purchased IP to prevent being classified as spam. We tested the functionality of the PTR and SPF record successfully using varies internet tools like dnsstuff.com, mxtoolbox.com, and kitterman.com. Unfortunately, when we send emails to any AT&T or Network Solutions hosted email we are being block as a spam abuser. I checked varies spam database tools and our IP addresses are not listed, but we are still being blocked by both AT&T and Network Solution. The block message is 521 DNSRBL: Blocked for abuse. In an attempt to be proactive, I contacted Network Solution and was told that each recipient would have to request we be whitelisted, and AT&T directed me to an online form that I submitted to be removed from the blacklist. Unfortunately, we are still not able to send emails to either AT&T or Network Solutions hosted emails. Our mail server IP address is 74.112.99.25, which resolves to mail.abcsupply.com. Does anyone have any suggestions on where to turn next? Is it possible they are blocking us based on old information from the previous IP address block owner? Any help tracking this down would be appreciated. Derrick Wash Microsoft Systems Administrator ABC Supply Company Inc Office: (608)368-2214 Fax: (608)363-0214
Current thread:
- The block message is 521 DNSRBL: Blocked for abuse NANOG (Sep 18)
- Re: The block message is 521 DNSRBL: Blocked for abuse Michael Schuler (Sep 18)
- Re: The block message is 521 DNSRBL: Blocked for abuse John LeCoque (Sep 18)
- Re: The block message is 521 DNSRBL: Blocked for abuse Rich Kulawiec (Sep 19)
- Re: The block message is 521 DNSRBL: Blocked for abuse Bill Woodcock (Sep 18)
- Re: The block message is 521 DNSRBL: Blocked for abuse Jean-Francois . TremblayING (Sep 18)
- Re: The block message is 521 DNSRBL: Blocked for abuse Carlos Kamtha (Sep 18)
- <Possible follow-ups>
- RE:The block message is 521 DNSRBL: Blocked for abuse Timothy Metzinger (Sep 18)
- Re: The block message is 521 DNSRBL: Blocked for abuse Andrew D Kirch (Sep 18)
- Re: The block message is 521 DNSRBL: Blocked for abuse Tammy Firefly (Sep 18)
- Re: The block message is 521 DNSRBL: Blocked for abuse Andrew D Kirch (Sep 18)
- Message not available
- Re: The block message is 521 DNSRBL: Blocked for abuse Andrew D Kirch (Sep 18)
- Re: The block message is 521 DNSRBL: Blocked for abuse David Miller (Sep 18)
- Re: The block message is 521 DNSRBL: Blocked for abuse Tammy Firefly (Sep 18)
- Re: The block message is 521 DNSRBL: Blocked for abuse Tammy Firefly (Sep 18)
- Re: The block message is 521 DNSRBL: Blocked for abuse staticsafe (Sep 18)
- Re: The block message is 521 DNSRBL: Blocked for abuse David Miller (Sep 18)
- Re: The block message is 521 DNSRBL: Blocked for abuse Andrew D Kirch (Sep 18)