Comment 6 for bug 264306

I'm seeing this again with 1:1.1.4-0ubuntu1.2:

deliver(mdz): Nov 25 12:07:45 Panic: file sieve-cmu.c: line 90 (unfold_header): assertion failed: (str[i] == ' ' || str[i] == '\t')
deliver(mdz): Nov 25 12:07:45 Error: Raw backtrace: /usr/lib/dovecot/deliver [0xb7f1ce01] -> /usr/lib/dovecot/deliver(default_fatal_handler+0x4c) [0xb7f1cf4c] -> /usr/lib/dovecot/deliver [0xb7f1c695] -> /usr/lib/dovecot/modules/lda/lib90_cmusieve_plugin.so [0xb7cd769f] -> /usr/lib/dovecot/modules/lda/lib90_cmusieve_plugin.so [0xb7ce20b9] -> /usr/lib/dovecot/modules/lda/lib90_cmusieve_plugin.so [0xb7ce1d6b] -> /usr/lib/dovecot/modules/lda/lib90_cmusieve_plugin.so(sieve_eval_bc+0x47e) [0xb7ce333e] -> /usr/lib/dovecot/modules/lda/lib90_cmusieve_plugin.so(sieve_execute_bytecode+0x125) [0xb7ce94d5] -> /usr/lib/dovecot/modules/lda/lib90_cmusieve_plugin.so(cmu_sieve_run+0x325) [0xb7cd8785] -> /usr/lib/dovecot/modules/lda/lib90_cmusieve_plugin.so [0xb7cd6456] -> /usr/lib/dovecot/deliver(main+0x1229) [0xb7ea6c39] -> /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe5) [0xb7d09685] -> /usr/lib/dovecot/deliver [0xb7ea4531]