On Wed, Apr 29, 2009 at 01:01:36PM +0430, Nasser Heidari wrote:

> Hi,
> This is Nasser.
> I'm running postfix-2.5.5,1 on FreeBSD 7.1-STABLE .
> Today I take a look at my graphs and see there are about 1500 Email in
> Queue.
> Then I run mailq on the server and see lots of messages like this:
> 
> (delivery temporarily suspended: lost connection with
> mail.xyz.ab[1.2.3.4] while receiving the initial server greeting)
> 
> What does lost connection with ... while receiving the initial server
> greeting) means?

Normal server greeting:

        Postfix Client  <->     RemoteServer
        ------------------------------------
        SYN ->
                             <- SYN-ACK (30s or less later)
        ACK ->
                             <- 220 mail.example.com ESMTP (300s or less later)

Lost connection while receiving the initial server greeting:

        Postfix Client  <->     RemoteServer
        ------------------------------------
        SYN ->
                             <- SYN-ACK (30s or less later)
        ACK ->
                             <- RST or 300s or more delay 

> Is it related to my configuration?

Unlikely, but the remote server could be overloaded, or deliberately
dropping connections from you at the application layer (kernel
accepts connections, but the application closes them) or as mentioned
by others there could be firewall issues.

-- 
        Viktor.

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