Le 12/12/2010 19:23, Giampaolo Tomassoni a écrit :
How does it work?
I just got blocked by the AT&T's blacklist (in contacting ab...@att.com,
besides...), but I'm pretty sure my MX is not an open relay or other kind of
nifty thing.
Maybe AT&T blocks whole address bunches from which some hosts are spamming?
Because this could explain me why: my MX is co-located...
$ host tomassoni.biz
tomassoni.biz has address 62.149.201.242
tomassoni.biz has address 62.149.220.102
tomassoni.biz mail is handled by 10 c0.edlui.it.
$ host c0.edlui.it
c0.edlui.it has address 62.149.220.102
c0.edlui.it has address 62.149.201.242
$ host 62.149.201.242
242.201.149.62.in-addr.arpa domain name pointer
host242-201-149-62.serverdedicati.aruba.it.
$ host 62.149.220.102
102.220.149.62.in-addr.arpa domain name pointer
host102-220-149-62.serverdedicati.aruba.it.
So both IPs use generic hostnames, which are a sign of "half configured"
servers.
think as the receiving side. when I see spam out of joe.spam.example, I
blocklist spam.example (and possibly every IP and domain related to
them). If I see spam coming from host1-2-364.serverdedicati.aruba.it,
what will I blacklist?
