Author: John Hall Date: To: exim-users Subject: Re: [exim] SMTP Banner delay of 2 mins 30 seconds
On Wed, May 6, 2009 at 00:40, Eric Cross <ecross@???> wrote:
> Our mailserver (non-Exim..it's Kerio 6.6.2) is experiencing a consistent and
> repeatable smtp banner delay when connecting to Exim 4.69 mail servers.
> When telnet'ing from our outbound MTA to port 25 on four different Exim 4.69
> domains/servers there is a delay of precisely 2 minutes and 30 seconds
> before I see the SMTP banner. When I telnet from a different IP address
> (same /24 network as the Kerio mail server) to the same four Exim servers, I
> receive no delay.
>
> I suspect there is some type of greylisting/antispam going on here, but the
> delay seems to be quite excessive. I have checked spamhaus to see if our
> server's IP is listed currently, but it is not.
>
> Would you folks know of a reason why Exim build 4.69 would be behaving this
> way consistently across four different domains? I have not seen this issue
> other than on Exim 4.69 (but I have only seen it today on these four
> domains).
It is more likely that the other end is doing a reverse lookup and
that is timing out. Do you have a PTR record setup for that IP
address?
