On Sunday 22 July 2007, Rob Kettle wrote:
> Hi,
>
> every time I send an email from my client (Thunderbird) using Courier
> (on either port 25 or 587) there seems to be a 30 second delay before it
> is accepted by the server.
>
> Also if I telnet to the server on port 25 or 587 there is a 30 second
> delay before the banner appears.
>
> What is causing this delay please and can I change it ?
>
> It does not happen with my old server running sendmail.


Try these two things:

- Remove any DNS blacklists with high latency

- set in /etc/courier/esmtpd one or both of the following:
TCPDOPTS="-nodnslookup -noidentlookup"

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