mail trouble caused by DNS?

johnny at n0sq.net johnny at n0sq.net
Tue Oct 7 02:49:55 UTC 2003


Barry Margolin wrote:

> In article <bls9js$2onu$1 at sf1.isc.org>,  <johnny at n0sq.net> wrote:
>>This might be slightly off-topic, but, I've been trying to determine why
>>I'm not receiving e-mail from certain list servers. I came across a log
>>entry that stated "lost input channel from....". I'm wondering if that is
>>causing the problem. I searched for info using Google and an article
>>mentioned that a dnsbl (DNS blacklist) may be causing too long of a delay
>>that causes the sending server to time out. I'm not running a blacklist at
>>this time. Is there something else concerning DNS that could be causing my
>>problem?
> 
> Is your mail server configured to reject mail from servers with no reverse
> DNS?  If so, it could be timing out trying to look up the reverse DNS, as
> many sites don't have their reverse DNS configured properly.
> 

I don't know. I'll have to research that. But, I would expect to see a log 
entry to that effect.

I'm running Sendmail 8.12 on ML 9.1.




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