Tom Hendrikx:
> >> However, it seems that the error message is only sent in the smtp dialog
> >> (554 5.4.0 Error: too many hops), postfix logging does not show
> >> anything. All I get in non-verbose logging is:
> >>
> >> Sep 18 12:38:58 test postfix-inbound/smtpd[29852]: connect from
> >> localhost[127.0.0.1]
> >> Sep 18 12:39:05 test postfix-inbound/smtpd[29852]: 3hzHmT118bz317f:
> >> client=localhost[127.0.0.1]
> >> Sep 18 12:39:17 test postfix-inbound/smtpd[29852]: disconnect from
> >> localhost[127.0.0.1]
> >>
> >> Is there a way to detect a 'too many hops' issue from the logging,
> >> preferably without changing postfix verbosity?
> >
> > Does the SMTP client log the rejected command (like Postfix does)?
> > If not, which program should be changed?
Asking this, because the client runs on the same machine (connecting
from localhost[127.0.0.1]), so you might have the information already.
> This works great for f.i. dnsbl rejects, but for some scenarios, there
> is no suitable message in postfix logging to work with. This basically
> means that we have to tell customers 'we don't know for sure, but try
> and ask <third party> who might have sent it', which sucks for obvious
> reasons.
>
> We also had similar issues with exceeding message_size_limit in MAIL
> FROM command, which does not log the sender e-mail address, making it
> hard to actually find the relevant log entries when questions are asked:
> there is only a timestamp + sender ip to work with.
>
> But from your remark about 'which program should be changed', I may
> conclude that this is not possible?
There are tons of 5XX server responses without logging. To begin
with, Postfix generally does not log SMTP command name or command
parameter errors because that could easily be mis-used to jam up
the logfile with garbage.
However, the cleanup daemon should probably log when it sets the
"hop-count" error flag, just like it logs when it sets the "write
error" flag.
Wietse
--- /var/tmp/postfix-2.12-20140907/src/cleanup/cleanup_message.c
2013-11-12 12:53:03.000000000 -0500
+++ ./cleanup_message.c 2014-09-18 11:10:32.000000000 -0400
@@ -580,8 +580,11 @@
if (hdr_opts->type == HDR_RESENT_MESSAGE_ID)
msg_info("%s: resent-message-id=%s", state->queue_id, hdrval);
if (hdr_opts->type == HDR_RECEIVED)
- if (++state->hop_count >= var_hopcount_limit)
+ if (++state->hop_count >= var_hopcount_limit) {
+ msg_warn("%s: message rejected: hopcount exceeded",
+ state->queue_id);
state->errs |= CLEANUP_STAT_HOPS;
+ }
if (CLEANUP_OUT_OK(state)) {
if (hdr_opts->flags & HDR_OPT_RR)
state->resent = "Resent-";
