SQLException: Column 'envelope' cannot be null / self->content is not a message

dbmail-3.1.17 with latest fixes

what's that for new stuff below flooding our server?
looks like some crazy client is trying to save drafts or something like 
that, however, the result is that the number of this errors grows day 
for day with each dbmail-util run
___________________________________________________________

Mar 10 16:28:13 caladan dbmail/maintenance[14421]: Error:[message] 
dbmail_message_cache_envelope(+1844): SQLException: Column 'envelope' 
cannot be null
Mar 10 16:28:13 caladan dbmail/maintenance[14421]: Error:[message] 
dbmail_message_cache_envelope(+1846): insert envelope failed [(null)]
Mar 10 16:28:13 caladan dbmail/maintenance[14421]: Error:[message] 
dbmail_message_cache_envelope(+1844): SQLException: Column 'envelope' 
cannot be null
Mar 10 16:28:13 caladan dbmail/maintenance[14421]: Error:[message] 
dbmail_message_cache_envelope(+1846): insert envelope failed [(null)]
Mar 10 16:28:13 caladan dbmail/maintenance[14421]: Error:[message] 
dbmail_message_cache_headers(+1324): self->content is not a message
Mar 10 16:28:13 caladan dbmail/maintenance[14421]: Warning:[db] 
db_set_headercache(+1617): error caching headers for physmessage: [853193]
Mar 10 16:28:13 caladan dbmail/maintenance[14421]: Error:[message] 
dbmail_message_cache_headers(+1324): self->content is not a message
Mar 10 16:28:13 caladan dbmail/maintenance[14421]: Warning:[db] 
db_set_headercache(+1617): error caching headers for physmessage: [853192]
Mar 10 16:28:14 caladan dbmail/maintenance[14423]: Error:[message] 
dbmail_message_cache_envelope(+1844): SQLException: Column 'envelope' 
cannot be null
Mar 10 16:28:14 caladan dbmail/maintenance[14423]: Error:[message] 
dbmail_message_cache_envelope(+1846): insert envelope failed [(null)]
Mar 10 16:28:14 caladan dbmail/maintenance[14423]: Error:[message] 
dbmail_message_cache_envelope(+1844): SQLException: Column 'envelope' 
cannot be null
Mar 10 16:28:14 caladan dbmail/maintenance[14423]: Error:[message] 
dbmail_message_cache_envelope(+1846): insert envelope failed [(null)]
Mar 10 16:28:14 caladan dbmail/maintenance[14423]: Error:[message] 
dbmail_message_cache_headers(+1324): self->content is not a message
Mar 10 16:28:14 caladan dbmail/maintenance[14423]: Warning:[db] 
db_set_headercache(+1617): error caching headers for physmessage: [853193]
Mar 10 16:28:14 caladan dbmail/maintenance[14423]: Error:[message] 
dbmail_message_cache_headers(+1324): self->content is not a message
Mar 10 16:28:14 caladan dbmail/maintenance[14423]: Warning:[db] 
db_set_headercache(+1617): error caching headers for physmessage: [853192]
Mar 10 16:28:14 caladan dbmail/maintenance[14425]: Error:[message] 
dbmail_message_cache_envelope(+1844): SQLException: Column 'envelope' 
cannot be null
Mar 10 16:28:14 caladan dbmail/maintenance[14425]: Error:[message] 
dbmail_message_cache_envelope(+1846): insert envelope failed [(null)]
Mar 10 16:28:14 caladan dbmail/maintenance[14425]: Error:[message] 
dbmail_message_cache_envelope(+1844): SQLException: Column 'envelope' 
cannot be null
Mar 10 16:28:14 caladan dbmail/maintenance[14425]: Error:[message] 
dbmail_message_cache_envelope(+1846): insert envelope failed [(null)]
Mar 10 16:28:14 caladan dbmail/maintenance[14425]: Error:[message] 
dbmail_message_cache_headers(+1324): self->content is not a message
Mar 10 16:28:14 caladan dbmail/maintenance[14425]: Warning:[db] 
db_set_headercache(+1617): error caching headers for physmessage: [853193]
Mar 10 16:28:14 caladan dbmail/maintenance[14425]: Error:[message] 
dbmail_message_cache_headers(+1324): self->content is not a message
Mar 10 16:28:14 caladan dbmail/maintenance[14425]: Warning:[db] 
db_set_headercache(+1617): error caching headers for physmessage: [853192]
___________________________________________________________

Mar 10 16:29:20 caladan dbmail/imap4d[1128]: Error:[message] 
dbmail_message_cache_headers(+1324): self->content is not a message
Mar 10 16:29:20 caladan dbmail/imap4d[1128]: Error:[message] 
dbmail_message_cache_headers(+1324): self->content is not a message
Mar 10 16:29:20 caladan dbmail/imap4d[1128]: Error:[message] 
dbmail_message_cache_headers(+1324): self->content is not a message
Mar 10 16:29:20 caladan dbmail/imap4d[1128]: Error:[message] 
dbmail_message_cache_headers(+1324): self->content is not a message
Mar 10 16:29:20 caladan dbmail/imap4d[1128]: Error:[message] 
dbmail_message_cache_headers(+1324): self->content is not a message
Mar 10 16:29:20 caladan dbmail/imap4d[1128]: Error:[message] 
dbmail_message_cache_headers(+1324): self->content is not a message
Mar 10 16:29:20 caladan dbmail/imap4d[1128]: Error:[message] 
dbmail_message_cache_headers(+1324): self->content is not a message
Mar 10 16:29:20 caladan dbmail/imap4d[1128]: Error:[message] 
dbmail_message_cache_headers(+1324): self->content is not a message
Mar 10 16:29:20 caladan dbmail/imap4d[1128]: Error:[message] 
dbmail_message_cache_headers(+1324): self->content is not a message
Mar 10 16:29:20 caladan dbmail/imap4d[1128]: Error:[imap] 
_ic_append_enter(+1316): [0x55dce60f65b0] error appending msg

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