Security Basics mailing list archives
Re: RBLs for SPAM Control
From: Devdas Bhagat <devdas () dvb homelinux org>
Date: Thu, 4 Aug 2005 14:38:47 +0530
On 03/08/05 11:48 +1000, Alexis wrote:
Well, this morning i discovered that the IP address recently allocated to me by my ISP is on the dnsbl.sorbs.net RBL . . . . :-/ i must say i'm not enthused about the notion of being false-positived by spamfilters worldwide, particularly since i maintain a tiny mailing list which sends out a news email to ~20 people each day.
Your next paragraph indicates that you are on the duhl.dnsbl.sorbs.net list. That is especially meant to list dynamic IP addresses which should not be sending direct to MX.
Of course, i could shut down my net connection, wait a bit, then restart it in the hope that DHCP allocates me a different IP (although there's obviously no guarantee that the new IP won't be on an RBL as well). But this has got me wondering: how does an IP address get /removed/ from RBLs? Is there some sort of 'time-out' period, where if there are no reports of spam from a particular IP after a certain length of time, it gets removed from the list? Otherwise, i suspect that in the not-too-distant future, ISPs will find most of their IP address pool on an RBL . . . .
Different DNSBLs have different policies. list.dsbl.org does not time out, but delists on request. The sbl removes IPs based on the removal of the spammer. Spamcop has a three day lifetime for its entries. Normal entries from dnsbl.sorbs.net expire in three months, but never from the duhl. Devdas Bhagat
Alexis.
Current thread:
- Re: RBLs for SPAM Control security (Aug 01)
- <Possible follow-ups>
- RE: RBLs for SPAM Control Chris Santerre (Aug 02)
- Re: RBLs for SPAM Control Devdas Bhagat (Aug 02)
- Re: RBLs for SPAM Control Micheal Espinola Jr (Aug 02)
- Re: Re: RBLs for SPAM Control Phil Cryer (Aug 03)
- Re: RBLs for SPAM Control Alexis (Aug 03)
- Re: RBLs for SPAM Control Devdas Bhagat (Aug 04)
- Re: RBLs for SPAM Control Alexis (Aug 05)
- Message not available
- Re: RBLs for SPAM Control Alexis (Aug 05)
- Re: RBLs for SPAM Control Devdas Bhagat (Aug 08)
- RE: RBLs for SPAM Control David Gillett (Aug 10)
- Re: RBLs for SPAM Control Devdas Bhagat (Aug 04)
- Re: RBLs for SPAM Control maxfield (Aug 08)