Author: Eric Messick Date: To: exim-users Subject: Re: [exim] Sender verification, permanent vs. transient error codes
On 1/25/07, Eric Messick <nanosyzygy@???> wrote: >
>
>
> On 1/25/07, Magnus Holmgren <holmgren@???> wrote:
> >
> >
> > No, I connected (with telnet) to [209.51.152.98]:25, said (after EHLO)
> > MAIL
> > FROM: magnus@??? and RCPT TO: postmaster@(the domain name in the
> > greeting). No error. Now I did the same, but with MAIL FROM:
> > postmaster@???. Again no error.
>
>
> Hmmm.... I should try that while I'm watching packets.
>
> That would tend to support the "got stuck in the bad guy DBM database"
> theory. Why else would some addresses succeed and others fail?
>
Ok, I tried it myself, and here's what I found.
RCPT TO: postmaster@??? gets accepted immediately without doing a sender
verify at all.
All other combinations result in a sender verify which fails after a 30
second timeout.
When I telnet to my own address, I get the 220 greeting immediately. When
they try the sender verify, I give them at least a 30 second delay, and they
close and fail the verify.
Looks like I need to find out where that delay is coming from on my side.
