Okay, I am one step further.
I saw that I have several Mails inside my queues which cannot be transmitted into the journal Database.
Once I deleted those. The massive increase stopped. Now I just have to see why these are not beeing processed.
Here is the error: (I guess it is related to the missing from address)
Identity: tt-col-s248\3\6047313952802
Subject: Unzustellbar: Cron <xx@xxx> /usr/local/bin/clk_backup_to_tar_diff
Internet Message ID: <f67a6c96-7ea1-4304-9392-9877a543474c@journal.report.generator>
From Address: <>
Status: Wiederholen
Size (KB): 9089
Message Source Name: Journaling
Source IP: 255.255.255.255
SCL: 0
Date Received: 08.06.2015 06:50:19
Expiration Time:
Last Error: 400 4.4.7 The server responded with: 554 5.2.0 STOREDRV.Deliver.Exception:MessageSubmissionExceededException.MapiExceptionMaxSubmissionExceeded; Failed to process message due to a permanent exception with message Cannot save changes made to an item
to store. 16.55847:4D100000, 17.43559:0000000094000000000000000000000000000000, 20.52176:000F34840900000000000000, 20.50032:000F34847917000000000000, 255.23226:000F3484, 255.27962:0A000000, 255.27962:0E000000, 255.31418:09000000, 16.55847:F2000000, 17.43559:000000001801000000000000E401000000000000,
20.52176:000F34840900F01F2C000000, 20.50032:000F348479170010000F3484, 255.23226:07000000, 255.27962:0A000000, 255.27962:0C000000, 255.17082:DA040000, 0.18273:0A000000, 4.21921:DA040000, 255.27962:FA000000, 255.1494:00000000, 5.59176:0000A0004C696D69746174696F6E000000000000,
5.34600:CF9D1B0143757272656E7453697A650000000000, 4.42792:DA040000, 1.63016:0C000000, 4.39640:DA040000, 5.10786:0000000031352E30302E313037362E3030303A74742D636F6C2D73323438000000000000, 255.1750:2C000000, 255.31418:00000000, 0.21457:00000000, 4.19665:DA040000,
0.37632:00000000, 4.37888:DA040000 [Stage: CreateMessage]. The failure was replaced by a retry response because the message was marked for retry if rejected.
Queue ID: xxx\3
Recipients: xxx@xxx;3;3;[{LRT=};{LED=400 4.4.7 The server responded with: 554 5.2.0 STOREDRV.Deliver.Exception:MessageSubmissionExceededException.MapiExceptionMaxSubmissionExceeded; Failed to process message due to a permanent exception with message Cannot
save changes made to an item to store. 16.55847:4D100000, 17.43559:0000000094000000000000000000000000000000, 20.52176:000F34840900000000000000, 20.50032:000F34847917000000000000, 255.23226:000F3484, 255.27962:0A000000, 255.27962:0E000000, 255.31418:09000000,
16.55847:F2000000, 17.43559:000000001801000000000000E401000000000000, 20.52176:000F34840900F01F2C000000, 20.50032:000F348479170010000F3484, 255.23226:07000000, 255.27962:0A000000, 255.27962:0C000000, 255.17082:DA040000, 0.18273:0A000000, 4.21921:DA040000,
255.27962:FA000000, 255.1494:00000000, 5.59176:0000A0004C696D69746174696F6E000000000000, 5.34600:CF9D1B0143757272656E7453697A650000000000, 4.42792:DA040000, 1.63016:0C000000, 4.39640:DA040000, 5.10786:0000000031352E30302E313037362E3030303A74742D636F6C2D73323438000000000000,
255.1750:2C000000, 255.31418:00000000, 0.21457:00000000, 4.19665:DA040000, 0.37632:00000000, 4.37888:DA040000 [Stage: CreateMessage]. The failure was replaced by a retry response because the message was marked for retry if rejected.};{FQDN=};{IP=}];0;CN=......