Last night, it would appear that zen.spamhaus.org started blacklisting a
number of IPs assigned to Spectrum consumers, of which I am one.
When I tried telnetting to port 25 of my mail server and manually sending
a message to one of our virtual mailboxes, I got this error:
554 5.7.1 Service unavailable; Client host [<my-ip-address>] blocked using
zen.spamhaus.org
I tried putting a bunch of /8's that I know to be assigned to Spectrum,
one of which my own IP was definitely within, into rbl_override. I then
ran postmap rbl_override and restarted postfix.
No dice. Still got the error.
For the time being, I had to go into main.cf and comment out reference to
zen.spamhaus.org completely for now, but I would still prefer a more
granular solution.
BTW the smtpd_client_restrictions contains:
check_client_access hash:/usr/local/etc/postfix/rbl_override
This precedes all the reject references to specific blacklists.
I believe rbl_override has worked in the past. Any ideas why it's not
working in this case? This is what my Spectrum IP section looks like:
# Spectrum
23.0.0.0/8 OK
24.0.0.0/8 OK
50.0.0.0/8 OK
63.0.0.0/8 OK
64.0.0.0/8 OK
65.0.0.0/8 OK
66.0.0.0/8 OK
67.0.0.0/8 OK
68.0.0.0/8 OK
69.0.0.0/8 OK
70.0.0.0/8 OK
71.0.0.0/8 OK
72.0.0.0/8 OK
73.0.0.0/8 OK
74.0.0.0/8 OK
75.0.0.0/8 OK
76.0.0.0/8 OK
96.0.0.0/8 OK
97.0.0.0/8 OK
98.0.0.0/8 OK
99.0.0.0/8 OK
100.0.0.0/8 OK
104.0.0.0/8 OK
107.0.0.0/8 OK
108.0.0.0/8 OK
173.0.0.0/8 OK
174.0.0.0/8 OK
184.0.0.0/8 OK
199.0.0.0/8 OK
204.0.0.0/8 OK
205.0.0.0/8 OK
206.0.0.0/8 OK
207.0.0.0/8 OK
208.0.0.0/8 OK
209.0.0.0/8 OK
216.0.0.0/8 OK
TIA!
