[GRLUG] Postfix Error info

[Nathan Phillip Brink]

On Tue, Sep 10, 2013 at 11:09:03AM -0500, L. V. Lammert wrote:
> 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.

Have you tried looking postfix’s debug_peer_list configuration option?
See the smtpd manpage. You can list hostnames/IPs that postfix should
log extensively about. You can cause postfix to show the progress of
the SMTP conversation, to some extent, depending on what you set
debug_peer_level to. Maybe this information can reveal any root
problems...

> > 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
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-- 
binki

Look out for missing or extraneous apostrophes!
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