mail trouble caused by DNS?

[Barry Margolin]

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.

-- 
Barry Margolin, barry.margolin at level3.com
Level(3), Woburn, MA
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