I can't use directly the LMTP as suggested, because I couldn't specify
different source and class in a single socket. So my client retrains
mails sending to [hidden email] or [hidden email] which point to
one of above transport.
Reading BUG discussion, it seems that sometimes LMTP socket doesn't
answer, so dspamc dies. Do you have any hints to find why dspamc die?
It doesn't seem a mail related issue, because if I resend the mail
after dspamc died, dspamc retrains the mail correctly.