[NBLUG/talk] OT - Sending mail to comcast.net
dforbes at corp.sonic.net
Sun Nov 18 10:47:53 PST 2007
Mark Street wrote:
> Is anyone else having troubles sending to comcast.net customers? My mail
> servers have been getting timed out messages since mid to late September.
> Nov 17 21:35:56 penguin postfix/smtp: connect to
> mx2.comcast.net[18.104.22.168]: Connection timed out (port 25)
> Nov 17 21:36:26 penguin postfix/smtp: 39C27E7C517:
> to=<XXXXXXXX at comcast.net>, relay=none, delay=60, status=deferred (connect to
> mx1.comcast.net[22.214.171.124]: Connection timed out)
> I used a dns tool to lookup comcast.net's dns info and it returned the
> following which I thought was interesting...
> mx1.comcast.net claims to be host IMTA05.westchester.pa.mail.comcast.net [but
> that host is at 126.96.36.199 (may be cached), not 188.8.131.52].
> mx2.comcast.net claims to be host IMTA22.emeryville.ca.mail.comcast.net [but
> that host is at 184.108.40.206 (may be cached), not 220.127.116.11].
> $ dig mx comcast.net
> ; <<>> DiG 9.3.3rc2 <<>> mx comcast.net
> ;; global options: printcmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41239
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 4
> ;; QUESTION SECTION:
> ;comcast.net. IN MX
> ;; ANSWER SECTION:
> comcast.net. 16 IN MX 5 mx2.comcast.net.
> comcast.net. 16 IN MX 5 mx1.comcast.net.
> ;; AUTHORITY SECTION:
> comcast.net. 6389 IN NS dns102.comcast.net.
> comcast.net. 6389 IN NS dns101.comcast.net.
> ;; ADDITIONAL SECTION:
> mx1.comcast.net. 6616 IN A 18.104.22.168
> mx2.comcast.net. 7190 IN A 22.214.171.124
> dns101.comcast.net. 147796 IN A 126.96.36.199
> dns102.comcast.net. 153480 IN A 188.8.131.52
Possibly mx1 and mx2.comcast.net are load balanced based on location? I
received an email from a friend that is located in Oregon with those
headers, however when I'm in Oregon and I get email from him I don't see
those specific headers in question.
QMTA01.emeryville.ca.mail.comcast.net are in my headers suggest behind
the scenes location based routing.
I haven't, however been getting any timed out messages. Anyone here
work for Comcast?
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