Hi, we experienced some problems with white spaces in usernames (this was NOT our idea) authenticated bei dovecots ntlmhelper I wrote a little patch fixing this, if you would like. patch applies on 2.1.7 and 2.1.8 (tested those) diff -up ./src/auth/mech-winbind.c.username ./src/auth/mech-winbind.c --- ./src/auth/mech-winbind.c.username 2012-07-27 09:52:33.422553807 +0200 +++ ./src/auth/mech-winbind.c 2012-07-27 14:23:03.718619388 +0200 @@ -239,8 +239,16 @@ do_auth_continue(struct auth_request *au return HR_FAIL; } else if (strcmp(token[0], "AF") == 0) { const char *user, *p, *error; + int ti=1; + + if(gss_spnego) + ti=2; + /* some braindead administrators like spaces in usernames */ + user = token[ti]; + while(token[++ti]){ + user = t_strconcat(user, " ", token[ti], NULL); + } - user = gss_spnego ? token[2] : token[1]; i_assert(user != NULL); p = strchr(user, '\\');