This time using maildir instead of mdbox.
Fri Oct 30 21:08:16 server dovecot[27407]: lda(pid 27407 user userW):
Panic: file istream.c: line 104 (i_stream_read): assertion failed:
((size_t)ret+old_size == _stream->pos - _stream->skip)
0 libSystem.B.dylib 0x00007fff875f4eba __kill + 10
1 libSystem.B.dylib 0x00007fff875f4eac kill + 14
2 libSystem.B.dylib 0x00007fff87683519 raise + 25
3 libSystem.B.dylib 0x00007fff876a4e12 abort + 90
4 libdovecot.0.dylib 0x00000001000d1027
i_set_failure_file + 275
5 libdovecot.0.dylib 0x00000001000d03ec
i_syslog_error_handler + 0
6 libdovecot.0.dylib 0x00000001000d06d2 i_debug + 0
7 libdovecot.0.dylib 0x00000001000d9c00 i_stream_read +
392
8 libdovecot.0.dylib 0x00000001000d8104
i_stream_create_limit + 436
9 libdovecot.0.dylib 0x00000001000d9ab7 i_stream_read + 63
10 libdovecot.0.dylib 0x00000001000d9cf1
i_stream_read_data + 103
11 libdovecot.0.dylib 0x00000001000c4bef
message_parse_header_next + 145
12 libdovecot.0.dylib 0x00000001000c646f
message_parser_init_from_parts + 287
13 libdovecot.0.dylib 0x00000001000c5a4b
message_parser_parse_next_block + 133
14 libdovecot.0.dylib 0x00000001000c5bc8
message_parser_parse_header + 64
15 libdovecot-storage.0.dylib 0x0000000100043883
index_mail_parse_headers + 189
16 libdovecot-storage.0.dylib 0x0000000100043b53
index_mail_get_header_stream + 597
17 libdovecot-storage.0.dylib 0x0000000100043f89
index_mail_get_first_header + 49
18 libdovecot-storage.0.dylib 0x0000000100011d1d
mail_get_first_header + 15
19 dovecot-lda 0x0000000100002eda
mail_deliver_get_address + 24
20 dovecot-lda 0x00000001000020f0 main + 2484
21 dovecot-lda 0x0000000100001734 start + 52