Re: [exim] Sender verification failing sometimes

On Tue, 2011-06-14 at 00:24 -0400, Phil Pennock wrote:
> You're using sender *callout* verification to systems not under your
> administrative control.

Really? Not necessarily.

Using "deny !verify = sender" results in:

RCPT TO:<graeme@???>
550-Verification failed for <flirble@???>
550-Unrouteable address
550 Sender verify failed

for a non-existent sender domain, without callouts.

The log message is:

2011-06-14 20:56:19 H=[hostname] [ip address] I=[interface]:25
F=<flirble@???> rejected RCPT <graeme@???>:
Sender verify failed

That looks suspiciously close to identical to the OP's problem, doesn't
it? So, allowing for that, let's say that there was possibly a transient
DNS error which meant that the MTA in quuestion could not look up the
sender domain.

Religion, pfft. Let's deal with it scientifically, please.

Graeme