> OS? OS version? How was Exim built? How much of your configuration
> can you share with us? Compile configuration and runtime?
>
> Output of:
> exim -bP received_header_text
This is on Linux running kernel 2.6.26.6, running a spam-filtering email
gateway. Originally a Fedora Core 6, but I have regularly upgraded exposed
software by recompiling RPM packages. I made the RPM package for Exim 4.77
using the same specfile as I had used for version 4.71 and that version worked
without problems for two years.
I don't know what of compile configuration and runtime might be relevant, but I
have not changed anything when upgrading.
Unfortunately I cannot share the whole configuration file, but it is not
entirely trivial. Basically exim delivers incoming email to amavisd-new over
SMTP and receives them back over SMTP before doing final delivery, but then
there is a lot of ACL checks (ratelimits, explicit white/blacklistings,
SPF-checks, greylisting, etc.).
# exim -bP received_header_text
received_header_text = Received: ${if def:sender_rcvhost {from
$sender_rcvhost\n\t}{${if def:sender_ident {from $sender_ident }}${if
def:sender_helo_name {(helo=$sender_helo_name)\n\t}}}}${if def:tls_peerdn
{(${if eq{$tls_certificate_verified}{1} {Verified}{Unverified}}
$tls_peerdn)\n\t}}by $primary_hostname ${if def:received_protocol {with
$received_protocol}} ${if def:tls_cipher {($tls_cipher) }}(Exim
$version_number)\n\tid $message_id${if def:received_for {\n\tfor
<$received_for>}}
Nothing in the configuration, build process, environment or anything really has
changed, I just upgraded the binary. I have tried eyeballing through a diff of
the sources between 4.71 and 4.77 but have not been able to spot anything
suspicious. Of course a random memory corruption due to some subtle changes
e.g. in some ACL or lookup implemention are hard to find, but then I probably
wouldn't be the only one to have problems.
And the problems are really sparse. I have now had a total of four incidents
within a week (three of which were within 8 hours last night) on a server
receiving about 1000 emails per day (and temporarily rejecting around 1000
messages per day due to greylisting in the SMTP RCPT ACL).
Very hard to track down what might be the problem when it cannot be reproduced
at will. Perhaps it was just cosmic radiation (not using ECC memory) and a
strange coincidence that it happened just after upgrading Exim. I should try to
do a full memtest on the server just to be sure, but that is not the easiest
thing to do on a server in production use..
--
[email protected] GSM +358-40-767 8282
Oy Arrak Software Ab http://www.arrak.fi
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