North American Network Operators Group

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Re: and other impatient Postfix mailers everywhere

  • From: Joel Baker
  • Date: Thu Aug 02 14:38:02 2001

[email protected] wrote:
> If you are receiving larger numbers of reports about failing mail
> transport from your customers these days, here is why.
> Apparently, the nameservers for the and
> zones are overloaded (I get <10% ICMP_echo's
> back, and virtually never any DNS answers), causing a more than
> 60-second connection-established -> 220 Hello banner
> answering delay on typical Unix-based Sendmail (and other SMTP)
> servers with default DNS resolver timeouts.

Perhaps this is related? (Server blocked off, rather than answering with
a query-denied, perhaps?)
Joel Baker                           System Administrator -
[email protected]