Split Sendmail Config
Michael Fleming
mfleming at enlartenment.com
Tue Mar 13 13:02:11 UTC 2007
On Tue, 2007-03-13 at 12:48 +0000, Jonathan Allen wrote:
> Jim van Wel wrote:
> >
> > You should get an error back. So what's the error?
>
> No error, it never leaves the queue. It just sits there complaining
> about a read error. Standard "warning 4 hours" and then "error 5 days"
> messages from sendmail on our mailhost.
>
> If I switch over for ten minutes to our ISP's smarthost then it's
> gone in just a few seconds and charter.net accept delivery from them.
>
> If I try to connect to their SMTP port by hand:
>
> mirror!~ % telnet charter.net 25
> Trying 64.192.190.12...
> telnet: connect to address 64.192.190.12: Connection refused
> telnet: Unable to connect to remote host: Connection refused
>
> So I think it's an IP address based thing at their end.
>
That address doesn't have an SMTP server listening. For mail delivery,
the DNS MX (Mail eXchanger) record is used. a "dig mx charter.net" gives
me the following:
[mfleming at defender mail]$ dig mx charter.net
; <<>> DiG 9.3.4 <<>> mx charter.net
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52277
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 3
;; QUESTION SECTION:
;charter.net. IN MX
;; ANSWER SECTION:
charter.net. 75909 IN MX 10 mail.charter.net.
;; AUTHORITY SECTION:
charter.net. 162311 IN NS auth0.ns.charter.net.
charter.net. 162311 IN NS auth1.ns.charter.net.
;; ADDITIONAL SECTION:
mail.charter.net. 75909 IN A 209.225.8.224
auth0.ns.charter.net. 162309 IN A 209.225.8.42
auth1.ns.charter.net. 162309 IN A 24.240.141.241
;; Query time: 24 msec
;; SERVER: 10.0.4.35#53(10.0.4.35)
;; WHEN: Tue Mar 13 22:57:23 2007
;; MSG SIZE rcvd: 141
....connecting to port 25 (smtp) on the "mail.charter.net" address gives
me the following:
[mfleming at defender mail]$ telnet mail.charter.net 25
Trying 209.225.8.224...
Connected to mail.charter.net (209.225.8.224).
Escape character is '^]'.
220 charter.net ESMTP server ready Tue, 13 Mar 2007 09:00:41 -0400
Your mileage may vary, but the 209.225.8.224 IP is the one you really
want to talk to.
> Jonathan
Michael.
--
Michael Fleming <mfleming at enlartenment.com> in Brisbane, Australia
"Be master of your mind, not mastered by mind"
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