stracing sendmail seems even more interesting:

fstat64(8, {st_mode=S_IFREG|0755, st_size=82232, ...}) = 0 mmap2(NULL, 92096, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 8, 0) = 0xb7de7000 mmap2(0xb7dfa000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED| MAP_DENYWRITE, 8, 0x12) = 0xb7dfa000 mmap2(0xb7dfc000, 6080, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED| MAP_ANONYMOUS, -1, 0) = 0xb7dfc000 close(8) = 0 munmap(0xb7e09000, 17532) = 0 open("/etc/ld.so.cache", O_RDONLY) = 8 fstat64(8, {st_mode=S_IFREG|0644, st_size=17532, ...}) = 0 mmap2(NULL, 17532, PROT_READ, MAP_PRIVATE, 8, 0) = 0xb7e09000 close(8) = 0 open("/lib/libnss_nis.so.2", O_RDONLY) = 8 read(8, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\360\32"..., 512) = 512 fstat64(8, {st_mode=S_IFREG|0755, st_size=39476, ...}) = 0 mmap2(NULL, 41484, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 8, 0) = 0xb7ddc000 mmap2(0xb7de5000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED| MAP_DENYWRITE, 8, 0x8) = 0xb7de5000 close(8) = 0 open("/lib/libnss_files.so.2", O_RDONLY) = 8 read(8, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\300\31"..., 512) = 512 fstat64(8, {st_mode=S_IFREG|0755, st_size=39304, ...}) = 0 mmap2(NULL, 41580, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 8, 0) = 0xb7dd1000 mmap2(0xb7dda000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED| MAP_DENYWRITE, 8, 0x8) = 0xb7dda000 close(8) = 0 munmap(0xb7e09000, 17532) = 0 open("/etc/passwd", O_RDONLY) = 8 fcntl64(8, F_GETFD) = 0 fcntl64(8, F_SETFD, FD_CLOEXEC) = 0 _llseek(8, 0, [0], SEEK_CUR) = 0 fstat64(8, {st_mode=S_IFREG|0644, st_size=1202, ...}) = 0 mmap2(NULL, 1202, PROT_READ, MAP_SHARED, 8, 0) = 0xb7f4d000 _llseek(8, 1202, [1202], SEEK_SET) = 0 munmap(0xb7f4d000, 1202) = 0 close(8) = 0 write(10, "apache\n", 7) = 7 read(12, "250 Ok.\n", 4096) = 8 fstat64(0, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f4d000 read(0, "To: Manuel Schneider <m.schneide"..., 4096) = 263 read(0, "", 4096) = 0 write(10, "\nTo: Manuel Schneider <m.schneid"..., 264) = 264 alarm(0) = 1800 rt_sigaction(SIGINT, {SIG_IGN}, {0x804af8b, [INT], SA_RESTORER|SA_RESTART, 0xb7e3a138}, 8) = 0 rt_sigaction(SIGTERM, {SIG_IGN}, {0x804af8b, [TERM], SA_RESTORER|SA_RESTART, 0xb7e3a138}, 8) = 0 rt_sigaction(SIGHUP, {SIG_IGN}, {0x804af8b, [HUP], SA_RESTORER|SA_RESTART, 0xb7e3a138}, 8) = 0 close(10) = 0 munmap(0xb7f4f000, 4096) = 0 read(12, "431 Mail system full.511 Headers"..., 4096) = 57 fstat64(1, {st_mode=S_IFCHR|0777, st_rdev=makedev(1, 3), ...}) = 0 ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, 0xbf90d5f4) = -1 ENOTTY (Inappropriate ioctl for device) mmap2(NULL, 131072, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7db1000 write(1, "431 Mail system full.511 Headers"..., 57) = 57 write(2, "sendmail: Unable to submit messa"..., 36) = 36 exit_group(75) = ?

"431 Mail system full.511 Headers" - Where does this comes from?

Greets,

Manuel

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