marco, I repeat: you don't need procmail, so remove it.
it's moving mails into maildir, so zarafa can't work properly
Ok Stefano, I've removed procmail, now I've found why it not work, for any user zarafa's enabled it not work, see my log
@400000004be013fc2aeae67c new msg 4016745
@400000004be013fc2aeafdec info msg 4016745: bytes 723 from <pippo@test.local> qp 8138 uid 453
@400000004be013fc2d04f894 starting delivery 13: msg 4016745 to local alias-localdelivery-user@test.local
@400000004be013fc2d051004 status: local 1/10 remote 0/20
@400000004be013fc2da30d54 new msg 4016739
@400000004be013fc2da324c4 info msg 4016739: bytes 841 from <pippo@test.local> qp 8141 uid 400
@400000004be013fc2de4bdbc starting delivery 14: msg 4016739 to local user@smeserver.test.local
@400000004be013fc2de4d52c status: local 2/10 remote 0/20
@400000004be013fc2de4e4cc delivery 13: success: forward:_qp_8141/did_0+0+1/
@400000004be013fc2de4f084 status: local 1/10 remote 0/20
@400000004be013fc2de50024 end msg 4016745
@400000004be013fc37df69d4 delivery 14: success: Failed_to_resolve_recipient_user/Unable_to_deliver_message_to_'user',_error_code:_0x8004010F/did_0+0+2/
@400000004be013fc37df852c status: local 0/10 remote 0/20
@400000004be013fc37df90e4 end msg 4016739