From the log:

Jan 7 16:16:44 postamt dovecot: imap(hxxxxnge): Panic: file squat-trie.c: line 876 (squat_build_word): assertion failed: (i + bytelen <= size) Jan 7 16:16:44 postamt dovecot: imap(hxxxxnge): Error: Raw backtrace: /usr/dovecot-2/lib/dovecot/libdovecot.so.0(+0x3bbe1) [0xb7745be1] -> /usr/dovecot-2/lib/dovecot/libdovecot.so.0(+0x3bc4f) [0xb7745c4f] -> /usr/dovecot-2/lib/dovecot/libdovecot.so.0(i_fatal+0) [0xb771c82e] -> /usr/dovecot-2/lib/dovecot/lib21_fts_squat_plugin.so(+0x566a) [0xb752a66a] -> /usr/dovecot-2/lib/dovecot/lib21_fts_squat_plugin.so(squat_trie_build_more+0x126)[0xb752aee6] -> /usr/dovecot-2/lib/dovecot/lib21_fts_squat_plugin.so(+0x2b9c) [0xb7527b9c] -> /usr/dovecot-2/lib/dovecot/lib20_fts_plugin.so(fts_backend_build_more+0x1f)[0xb75735af] -> /usr/dovecot-2/lib/dovecot/lib20_fts_plugin.so(+0x578c) [0xb757678c] -> /usr/dovecot-2/lib/dovecot/libdovecot-storage.so.0(mailbox_search_next_nonblock+0x38) [0xb77a5a78] -> dovecot/imap hxxxxnge 141.42.206.38 UID [0xb78788d6] -> dovecot/imap hxxxxnge 141.42.206.38 UID [0xb78792d8] -> dovecot/imap hxxxxnge 141.42.206.38 UID [0xb786e4d1] -> d

Jan 7 16:16:44 postamt dovecot: master: Error: service(imap): child 16959 killed with signal 6 (core dumped) Jan 7 16:16:50 postamt dovecot: imap(hxxxxnge): Panic: file squat-trie.c: line 876 (squat_build_word): assertion failed: (i + bytelen <= size) Jan 7 16:16:50 postamt dovecot: imap(hxxxxnge): Error: Raw backtrace: /usr/dovecot-2/lib/dovecot/libdovecot.so.0(+0x3bbe1) [0xb7738be1] -> /usr/dovecot-2/lib/dovecot/libdovecot.so.0(+0x3bc4f) [0xb7738c4f] -> /usr/dovecot-2/lib/dovecot/libdovecot.so.0(i_fatal+0) [0xb770f82e] -> /usr/dovecot-2/lib/dovecot/lib21_fts_squat_plugin.so(+0x566a) [0xb751d66a] -> /usr/dovecot-2/lib/dovecot/lib21_fts_squat_plugin.so(squat_trie_build_more+0x126)[0xb751dee6] -> /usr/dovecot-2/lib/dovecot/lib21_fts_squat_plugin.so(+0x2b9c) [0xb751ab9c] -> /usr/dovecot-2/lib/dovecot/lib20_fts_plugin.so(fts_backend_build_more+0x1f)[0xb75665af] -> /usr/dovecot-2/lib/dovecot/lib20_fts_plugin.so(+0x578c) [0xb756978c] -> /usr/dovecot-2/lib/dovecot/libdovecot-storage.so.0(mailbox_search_next_nonblock+0x38) [0xb7798a78] -> dovecot/imap hxxxxnge 141.42.206.38 UID [0xb786b8d6] -> dovecot/imap hxxxxnge 141.42.206.38 UID [0xb786c2d8] -> dovecot/imap hxxxxnge 141.42.206.38 UID [0xb78614d1] -> d

Jan 7 16:16:50 postamt dovecot: master: Error: service(imap): child 17558 killed with signal 6 (core dumped)

-- Ralf Hildebrandt Geschäftsbereich IT | Abteilung Netzwerk Charité - Universitätsmedizin Berlin Campus Benjamin Franklin Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 ralf.hildebrandt@charite.de | http://www.charite.de