On 10 Sep 2019, at 14:44, J Doe wrote:
Hello,
I have a question regarding DNSBL usage with the main.cf
smtpd_client_restrictions parameter.
I have a server configured to check SpamHaus:
main.cf
. . .
smtpd_client_restrictions = reject_rbl_client
zen.spamhaus.org=127.0.0.[2..11],
. . .
This has been working very well, although I noticed the following
error in my syslog:
Sep 7 16:13:08 server postfix/smtpd[28363]: warning:
188.50.102.94.zen.spamhaus.org: RBL lookup error: Host or domain name
not found. Name service error for name=188.50.102.94.zen.spamhaus.org
type=A: Host not found, try again
A common cause of this is is if your DNS resolver thinks that you have
IPv6 connectivity (e.g. because you have an autoconfigured interface or
a VPN with an IPv6 address) but you really do not. The extensive
collection of DNS servers handling the zen.spamhaus.org zone includes
many names that have as many AAAA records as they do A records and if
your resolvers tries one of those, you get a message as above.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
