Re: My Default SMTP Virtual Server does sometimes not send out my emails

I used to have the problem with the dynamic IP address and that's
the reason why my mail server forwards all the emails to the email
server of my provider.

Okay, then your logs can only show [1] connections between your
clients and your server and [2] connections between your server and
the smart host, *not* between the provider's outbound servers and the
destination domain. And indeed, on more inspection, what you are
showing are failed connections between, for example, the client
machine at private IP 10.176.1.2 and your server. That isn't what is
referred to as a _delivery_ problem. It is a _submission_ problem.

Specifically, it looks like the client is not sending the DATA command
properly or the server is not receiving the DATA command; the client
may not be receiving the acknowledgment of the RCPT command and thus
does not proceed to DATA.

As long as you have no anti-spam defenses on your submission server,
then these symptoms point to network errors (physical failure of
switchport, etc.) or erroneous inline filtering (if there is a
misconfigured application firewall between your clients and the
server, this can interfere with the proper sequence of commands).

You want to look at a debug-level client log if you can generate one,
or a network trace.

--Sandy


------------------------------------
Sanford Whiteman, Chief Technologist
Broadleaf Systems, a division of
Cypress Integrated Systems, Inc.
------------------------------------
.

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