Just to get a handle on my issue here (please correct me where I'm
wrong) :
my qmail is not sucessfully sending mail to many large mail servers
that we can presume are not all having problems at the same time.
the errors, can't establish an smtp connection, and cname deferral,
could both be due to a problem with dns lookups ?
No. The cname deferral is most likely a problem with DNS lookups. The
failure to establish smtp connection error you saw could be one of two
things: network problems, the recipient's server is down, or bad
domain info (on the part of the recipient). One thing that might cause
both is general network flakiness (e.g. if your router is dropping
lots of packets), but in general, they're separate problems that need
to be resolved separately.
The thing about the smtp connection errror is that it seems to be
occurring to murez.com, which is my uncle's domain, which is really fine
and responsive, and that handles all my incoming mail fine, without
losing any, and just happens to make errors when talking to my server,
which now can't send mail to even the biggest mail servers. This makes
me feel that there's definitely a problem on my side.
The other thing is : as far as I can tell, incoming mail from those same
external servers coming in through my server is completely fine.
this problem is happening now though it wasn't occuring before,
during a few years where my mail setup was working fine, and I made
no configuration changes.
Has *anything* about the box changed? Has anything about its
environment changed?
The only thing that happens that is new is that it hangs from time to
time, about once a month, and needs to be rebooted, whereas it used to
hang maybe once every year a while ago.
I have no idea why this happens, and it doesn't seem to affect any other
functions of the server.
The router which is a reliable external netgear hasn't changed at all.
Once again, I just tried the following :
[root@yoruban root]# cat /home/baronsam/shared/test_tbird_email.txt |
/var/qmail/bin/qmail-remote murez.com baronsam@samuelmurez.com sam@murez.com
ZSorry, I wasn't able to establish an SMTP connection. (#4.4.1)
[root@yoruban root]# dig murez.com
; <<>> DiG 9.2.1 <<>> murez.com
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 3092
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;murez.com. IN A
;; ANSWER SECTION:
murez.com. 172800 IN A 205.147.48.4
;; Query time: 232 msec
;; SERVER: 192.168.0.1#53(192.168.0.1)
;; WHEN: Mon May 21 23:32:22 2007
;; MSG SIZE rcvd: 43
which were done one right after the other
doesn't this make you think that there's something wrong with the way my
server's trying to send mail, rather than with the network ?
Do you have any ideas of other troubleshooting activities I could
undertake ?
Thanks,
--Sam
|