[GRLUG] Postfix Error info

[L. V. Lammert]

On Tue, 10 Sep 2013, megadave wrote:

> 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.
>
"Invalid Hostname" or "Hostname not found" is tantamount to a Postfix
error, .. "your hostname has no DNS record" may, or may not be a cause. It
could be a "_", as mentioned, .. it could be no reverse DNS, ,.. it could
be no MX record (!!), ..

That's why I am looking for more definitive reasons FOR the erros that
Postfix throws.

> 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.
>
What sort of SMTP servers and sample errors? I have used Sendmail &
Postfix, and the errors have always been similar to the ones mentioned.

> 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?
>
The server is being rejected, ..

> 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.
>
As could I - what SMTP are you using that provides specific errors if not
sendmail, Postfix, or perhaps smptd?

	Lee