[CentOS] C7 postfix problem

Thu Jan 28 14:24:30 UTC 2016
Rainer Traut <tr.ml at gmx.de>

Hi all,

topology: java/tomcat app mailing to the outside via a C7 postfix relay 

problem: java app submits mail to postfix but there is _nothing_ logged 
in the postfix maillog.
This happen for 2/3 of all mail submitted. We cannot see any trace of 
this submitted mail either incoming/stored/outgoing.

Log from java app (shortened):
DEBUG: getProvider() returning 
Microsystems, Inc]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "xxxxxxxx", port 25, isSSL false
DEBUG SMTP: Attempt to authenticate
235 2.7.0 Authentication successful
DEBUG SMTP: use8bit false
DEBUG SMTP: Verified Addresses
354 End data with <CR><LF>.<CR><LF>
****message text***
250 2.0.0 Ok: queued as 8D83AC2756DF
221 2.0.0 Bye

Log from the postfix server:
[root at xxx postfix]# grep 8D83AC2756DF /var/log/maillog
[root at xxx postfix]#

This happens for 2/3 of all messages send to this server.

Any idea what is happening here?

Thx Rainer