[GRLUG] Postfix Error info

[megadave]

Well, I wouldnt say "send a postfix error" to the sender.  I would use the
error message to determine what the problem is. (eg, "your hostname has no
DNS record", or "your hostname has an illegal character", etc) and then
tell them THAT.

Perhaps there is some documentation for postfix that might explain what
that error means. I am used to SMTP servers that give specific information
when they log an error that identifies exactly what the cause is.

I also make it a point to know exactly what conditions under which a server
I run does or does not accept mail from sender hosts.

I'm assuming you've done the basics and verified that the sender is sending
to the correct address, and that their email client is properly configured
with their valid sender address. Do you know if your server rejects ALL
mail from this sending server, or just from this one user?

If you'd like to get more information about the SMTP transaction from this
problematic sender, I could setup a temporary address on a server under my
control, and you could have your sender attempt to email it. If mine
rejects it, I would be able to tell you exactly why.  If it accepts it, I
may be able to provide details about the transaction that might help you
identify why your server is rejecting it.




On Tue, Sep 10, 2013 at 11:56 AM, L. V. Lammert <lvl at omnitec.net> wrote:

> On Tue, 10 Sep 2013, megadave wrote:
>
> > Does your receiver-SMTP not log the transactions, and provide specific
> > details for cases where it rejects?
> >
> Sure, .. Postfix dutifully logs the error "Hostname not found"; *however*
> there is no definitive souce that I have been able to identify as to WHY
> Postfix identifies that error.
>
> > It is certainly always better if you can specifically describe what the
> > sending server is doing wrong.
> >
> Bingo! That's what I would like to do! Send a Postfix error to some dork
> that thinks THEIR email server is configured properly is useless; what I
> am looking for is a detailed explanation of the causes for such errors.
>
> > Ultimately, if the sender wishes to be able to send to you, it may come
> > down to them demanding that their server operator identify and fix the
> > problem.
> >
> Been there, tried that - the response is typically "we don't have a
> problem - it's YOUR problem because YOUR server is rejecting OUR email".
>
> Hence the discussion on a more definitive source of the problem.
>
>         Lee
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