How to debug lmtpd?

Fri Jan 1 18:25:50 UTC 2016

1. I have dovecot installation with lmtp
2. there are some sieve filter which call mailpost to put mails in my
news server.
3. SOME mails are not mailposted :( I do not know why. Moreover these
mails filtered by dovecot-lda ARE mailposted whit the same sieve filter.
4. How can I debug lmtp and it's descendant processes? strace -ff  only?
KJ

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