Andy Green wrote:
Somebody in the thread at some point said:
Suddenly (starting yesterday) my mailserver is very slow when I send mail
through it.
I cranked up ettercap on the server to watch what's going on, and it connects
immediately when I send mail, but just sits there for between ten and thirty
seconds before it finally accepts the mail for sending.
On the server, what is in /etc/resolv.conf? What happens if you ssh
into the server and try to do, eg
dig <sending client ip>@<nameserver ip in server /etc/resolv.conf>
for example
dig 192.168.0.10@xxxxxxxxxxxxxxx
and how fast does it come back with a reply?
Are you using a realtime blackhole for lookup? Maybe that is slow.
-Andy
/etc/nsswitch.conf governs the lookup order. The FC6 config was files
then DNS, but I've seen other distros that had DNS prioritized over
/etc/hosts.
Two other things come to mind: IPv6. There was a discussion recently
how to turn off IPv6 in F7 or maybe something is amiss with an upstream
nameserver.
I'm not familiar with ethercap, but is anything else going on
network-wise while sendmail is sitting there? There is also a debugging
mode for sendmail, plus /var/log/maillog might tell you something.
Bob...
