the mailbox of a customer of mine was flooded by a mail that was repeatedly delivered to his mailbox. I had to delete 10Gb of data. I did that by deleting the grp files starting from Friday until today.
[2015.11.13] 15:51:45 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:51:45 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:51:49 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:51:49 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:51:54 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:51:54 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:51:59 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:51:59 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:52:04 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:52:04 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:52:09 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:52:09 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:52:14 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:52:14 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:52:19 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:52:19 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:52:24 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:52:24 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:52:29 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:52:29 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:52:34 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:52:34 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:52:39 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:52:39 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:52:44 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:52:44 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:52:49 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:52:49 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:52:54 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:52:54 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:52:59 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:52:59 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:53:04 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:53:04 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:53:09 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:53:09 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:53:14 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:53:14 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:53:19 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:53:19 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:53:24 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:53:24 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:53:29 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:53:29 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:53:34 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:53:34 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:53:39 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:53:39 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:53:44 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:53:44 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:53:49 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:53:49 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:53:54 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.13] 15:53:54 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.13] 15:53:59 [65821] Starting local delivery to info-at-bosenolgers.nl
this goes on and on.. for days :)
when the .grp file gets bigger than 2GB
then you see this
[2015.11.13] 15:55:43 [65821] Add message to mailbox call failed. Reason: Access to the grp file is locked
[2015.11.13] 15:55:48 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 14:24:12 [82502] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 14:24:12 [82502] Add message to mailbox call failed. Reason: Access to the grp file is locked
[2015.11.18] 14:24:12 [82502] Delivery attempt to info-at-bosenolgers.nl to folder 'Inbox' failed. Mailbox is locked.
[2015.11.18] 14:24:12 [81163] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 14:24:12 [81163] Add message to mailbox call failed. Reason: Access to the grp file is locked
[2015.11.18] 14:24:12 [81163] Delivery attempt to info-at-bosenolgers.nl to folder 'Inbox' failed. Mailbox is locked.
[2015.11.18] 14:24:12 [80827] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 14:24:12 [80827] Add message to mailbox call failed. Reason: Access to the grp file is locked
[2015.11.18] 14:24:12 [80827] Delivery attempt to info-at-bosenolgers.nl to folder 'Inbox' failed. Mailbox is locked.
[2015.11.18] 14:24:12 [79959] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 14:24:12 [79959] Add message to mailbox call failed. Reason: Access to the grp file is locked
[2015.11.18] 14:24:12 [79959] Delivery attempt to info-at-bosenolgers.nl to folder 'Inbox' failed. Mailbox is locked.
[2015.11.18] 14:24:12 [79958] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 14:24:12 [79958] Add message to mailbox call failed. Reason: Access to the grp file is locked
[2015.11.18] 14:24:12 [79958] Delivery attempt to info-at-bosenolgers.nl to folder 'Inbox' failed. Mailbox is locked.
[2015.11.18] 14:24:12 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 14:24:12 [65821] Add message to mailbox call failed. Reason: Access to the grp file is locked
[2015.11.18] 14:24:18 [84820] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 14:24:18 [84820] Add message to mailbox call failed. Reason: Access to the grp file is locked
[2015.11.18] 14:24:18 [84820] Delivery attempt to info-at-bosenolgers.nl to folder 'Inbox' failed. Mailbox is locked.
[2015.11.18] 14:24:18 [83028] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 14:24:18 [83028] Add message to mailbox call failed. Reason: Access to the grp file is locked
[2015.11.18] 14:24:18 [83028] Delivery attempt to info-at-bosenolgers.nl to folder 'Inbox' failed. Mailbox is locked.
[2015.11.18] 14:24:18 [82502] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 14:24:18 [82502] Add message to mailbox call failed. Reason: Access to the grp file is locked
[2015.11.18] 14:24:18 [82502] Delivery attempt to info-at-bosenolgers.nl to folder 'Inbox' failed. Mailbox is locked.
[2015.11.18] 14:24:18 [81163] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 14:24:18 [81163] Add message to mailbox call failed. Reason: Access to the grp file is locked
[2015.11.18] 14:24:18 [81163] Delivery attempt to info-at-bosenolgers.nl to folder 'Inbox' failed. Mailbox is locked.
[2015.11.18] 14:24:18 [80827] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 14:24:18 [80827] Add message to mailbox call failed. Reason: Access to the grp file is locked
[2015.11.18] 14:24:18 [80827] Delivery attempt to info-at-bosenolgers.nl to folder 'Inbox' failed. Mailbox is locked.
[2015.11.18] 14:24:18 [79959] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 14:24:18 [79959] Add message to mailbox call failed. Reason: Access to the grp file is locked
[2015.11.18] 14:24:18 [79959] Delivery attempt to info-at-bosenolgers.nl to folder 'Inbox' failed. Mailbox is locked.
[2015.11.18] 14:24:18 [79958] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 14:24:18 [79958] Add message to mailbox call failed. Reason: Access to the grp file is locked
[2015.11.18] 14:24:18 [79958] Delivery attempt to info-at-bosenolgers.nl to folder 'Inbox' failed. Mailbox is locked.
[2015.11.18] 15:41:28 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 15:41:28 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.18] 15:41:34 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 15:41:34 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.18] 15:41:39 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 15:41:39 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.18] 15:41:45 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 15:41:45 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.18] 15:41:50 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 15:41:50 [65821] Exception: rawText does not contain a valid rfc2822 header field
[2015.11.18] 15:41:56 [65821] Starting local delivery to info-at-bosenolgers.nl
[2015.11.18] 15:41:56 [65821] Exception: rawText does not contain a valid rfc2822 header field
header
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