Bug#303130: exim4-daemon-heavy: exim4 "forgets" emails in /var/spool/exim4/scan, leaving emails undelivered without notice

[Sebastian Hegler]

Package: exim4-daemon-heavy
Version: 4.50-4
Severity: critical
Justification: causes serious data loss

Lately, I found lots of undelivered emails in /var/spool/exim4/scan.
There was no notice about these emails not being delivered. They are just
stuck in that directory, "exim4 -bp" shows an empty queue. 
This probably happened due to low memory, but this definitely should not
happen under any circumstances.

My setup uses ClamAV as a virus scanner, default delivery to local users 
is by spamassassin, and then to a Maildir.


Could also somebody please help me to get the stuck messages delivered?
Thanks in advance!


-- Package-specific info:
Exim version 4.50 #1 built 02-Mar-2005 07:42:40
Copyright (c) University of Cambridge 2004
Berkeley DB: Sleepycat Software: Berkeley DB 4.2.52: (December  3, 2003)
Support for: iconv() IPv6 PAM Perl GnuTLS Content_Scanning Old_Demime
Lookups: lsearch wildlsearch nwildlsearch iplsearch cdb dbm dbmnz dnsdb dsearch ldap ldapdn ldapm mysql nis nis0 passwd pgsql
Authenticators: cram_md5 cyrus_sasl plaintext spa
Routers: accept dnslookup ipliteral iplookup manualroute queryprogram redirect
Transports: appendfile/maildir/mailstore/mbx autoreply lmtp pipe smtp
Fixed never_users: 0


-- System Information:
Debian Release: 3.1
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: i386 (i686)
Kernel: Linux 2.4.20-021stab028.3.777-enterprise
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)

Versions of packages exim4-daemon-heavy depends on:
ii  exim4-base                  4.50-4       support files for all exim MTA (v4
ii  libc6                       2.3.2.ds1-20 GNU C Library: Shared libraries an
ii  libdb4.2                    4.2.52-18    Berkeley v4.2 Database Libraries [
ii  libgnutls11                 1.0.16-9     GNU TLS library - runtime library
ii  libldap2                    2.1.30-3     OpenLDAP libraries
ii  libmysqlclient10            3.23.56-2    LGPL-licensed client library for M
ii  libpam0g                    0.76-22      Pluggable Authentication Modules l
ii  libpcre3                    4.5-1.1      Perl 5 Compatible Regular Expressi
ii  libperl5.8                  5.8.4-8      Shared Perl library
ii  libpq3                      7.4.7-2      PostgreSQL C client library
ii  libsasl2                    2.1.19-1.5   Authentication abstraction library

-- no debconf information