Invalid Recipients - over 50% of daily volume

Hi,
I searched this forum for DHAP related issues, but can't seem to find an answer to my question. We have a C100 and have DHAP enabled. The typical setting for a mail policy is about 10 invalid recipients, and a 5xx "Too many recipients for this hour" is returned.
For the past week, we've been getting so much invalid from recipeints from google.com, rr.com, and yahoo.com (domains that typically don't do this to us) that we've gone up to over 50% of our daily volume is invalid recipient. Typically this is somewhere around 2% to 7% on a daily basis.
My main concern is how does this affect the performance of the ironport? So far, the cpu usage/queue is looks ok. After the DHAP threshold is met, does the c100 silently drop the connection or does it always send the 5xx response?
I understand that the DHAP counter gets resets at the beginning of every hour. Does this mean that once google.com reaches the DHAP threshold that the entire domain is denied until the next hour when the counter resets or is the DHAP counter set specifically for servers and only the servers get denied?
I've read in some posts to change the 5xx response to 4xx - how does this affect the ironport and the mail servers who got blocked for the hour? Does this mean that the servers will simply keep trying over and over again later? How does this make the situation better?
Thank you in advance for any input.

Hi,
This really depends on what version you are on, Version 5.5 doesn't drop rcpts based on the attackers IP address anymore.
What version are you running?
Plus changing the 4xx code within the listener settings for the accept query is really on stating what to do if the LDAP server is unreachable.
What traditionaly happens is once the 10 invalid rcpts is reached the rest are silently dropped so that no notifications are sent apart from alerts to yourself.
Also in 5.5 both RAT rejects and LDAP accept rejects count towards the invalid rcpts number.
More information is available on the KB, search for asnwer id: 514

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    08/02/2014 22:11:46.565 com.apple.kextcache[2963]: kxld[com.apple.iokit.IOSCSIArchitectureModelFamily]: The super class vtable 'vtable for IOService' for vtable 'vtable for AppleSCSISubsystemGlobals' is out of date. Make sure your kext has been built against the correct headers.
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    08/02/2014 22:11:46.565 com.apple.kextcache[2963]: kxld[com.apple.iokit.IOSCSIArchitectureModelFamily]: The vtable for IOSCSILogicalUnitNub was not patched because its parent, the vtable for IOSCSIPeripheralDeviceNub, was not patchable.
    08/02/2014 22:11:46.565 com.apple.kextcache[2963]: kxld[com.apple.iokit.IOSCSIArchitectureModelFamily]: The vtable for IOSCSIProtocolServices was not patched because its parent, the vtable for IOSCSIProtocolInterface, was not patchable.
    08/02/2014 22:11:46.565 com.apple.kextcache[2963]: kxld[com.apple.iokit.IOSCSIArchitectureModelFamily]: The vtable for IOSCSIPeripheralDeviceNub was not patched because its parent, the vtable for IOSCSIProtocolServices, was not patchable.
    08/02/2014 22:11:46.565 com.apple.kextcache[2963]: kxld[com.apple.iokit.IOSCSIArchitectureModelFamily]: The vtable for IOSCSIPrimaryCommandsDevice was not patched because its parent, the vtable for IOSCSIProtocolInterface, was not patchable.
    08/02/2014 22:11:46.565 com.apple.kextcache[2963]: kxld[com.apple.iokit.IOSCSIArchitectureModelFamily]: The vtable for IOSCSIMultipathedLogicalUnit was not patched because its parent, the vtable for IOSCSIPeripheralDeviceNub, was not patchable.
    08/02/2014 22:11:46.565 com.apple.kextcache[2963]: kxld[com.apple.iokit.IOSCSIArchitectureModelFamily]: The vtable for IOSCSIHierarchicalLogicalUnit was not patched because its parent, the vtable for IOSCSIPeripheralDeviceNub, was not patchable.
    08/02/2014 22:11:46.566 com.apple.kextcache[2963]: Link failed (error code 5).
    08/02/2014 22:11:46.566 com.apple.kextcache[2963]: Prelink failed for com.apple.iokit.IOSCSIArchitectureModelFamily; omitting from prelinked kernel.
    08/02/2014 22:11:46.566 com.apple.kextcache[2963]: Can't use IOSCSIArchitectureModelFamily.kext - not linked.
    08/02/2014 22:11:46.566 com.apple.kextcache[2963]: Prelink failed for com.apple.iokit.IOSCSIParallelFamily; aborting prelink.
    08/02/2014 22:11:46.566 com.apple.kextcache[2963]: Failed to generate prelinked kernel.
    08/02/2014 22:11:46.570 com.apple.kextcache[2960]: Child process /usr/sbin/kextcache[2963] exited with status 71.
    08/02/2014 22:11:46.571 com.apple.kextcache[2960]: Error 107 rebuilding /System/Library/Caches/com.apple.kext.caches/Startup/kernelcache.
    08/02/2014 22:11:46.571 com.apple.kextd[12]: kextcache error while updating /Volumes/Seagate CCC (error count: 1)
    08/02/2014 22:11:46.876 com.apple.kextcache[2964]: Lock acquired; proceeding.
    08/02/2014 22:11:46.876 com.apple.kextd[12]: async child pid 2960 exited with status 71
    08/02/2014 22:11:46.876 com.apple.kextcache[2964]: rebuilding /System/Library/Caches/com.apple.kext.caches/Startup/kernelcache

    Hi,
    interesting: I have the same issue, however, I don't have any software from Freecom installed.
    Here is my situation, which - to me - is quite bizarre.
    Some weeks ago, I installed an SSD as the boot disk, moving my "old" HDD to the Superdrive bay.
    This worked quite well. I then upgraded to Mavericks (from ML).
    It's tough to say for certain, but my impression is that since I upgraded, things have gone quite awry.
    I'm seeing these Error 107 messages from kextcache as well, repeating over and over periodically. What is very odd is this: the cache is trying to update on the HDD! I checked; there is a Library and a System directory in the HHD's root.
    I figured I had forgotten to clear those out when I changed the HDD to be a data-only drive, and that Mavericks was using the System directory on the HDD because - well - it was there. So I deleted both the Library and System directories and rebooted.
    This fixed Pathfinder's lockup error (after updating), but - much to my surprise - the System directory is back!
    All it contains is a Library directory and that only has a Caches directory in it, which - no surprise - contains the com.apple.kext.caches directory. This subtree belongs to root with group wheel, so that should be ok.
    So:
    1) why on earth is Mavericks putting this directory on the HDD, and not on the SSD which contains the "real" system directory?
    2) why am I getting 107 errors?
    Here is the relevant part of my log:
    Apparently, I'm not the only one, I just found this discussion on what seems to be a similar subject:
    https://discussions.apple.com/thread/5490448
    Thanks!

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    JS_MACNewBie,
    Assuming Disk Warrior can successfully repair your file structure (good luck, BTW), this doesn't mean that you are "out of the woods."
    When you have a disk error, especially one as serious as the current one, some files will undoubtedly be damaged. Repairing the file system, when successful, does not repair the damaged files; it only returns the file system to a "consistent" state.
    If these damaged files are critical system files, you are going to continue to have problems. Disk Repair utilities (Disk Utility included) are indispensible tools, but they should be used only in emergencies such as yours to facilitate making a good backup prior to formatting and reinstalling.
    Only by formatting, then reinstalling can you "fix" the files that may have been damaged by the disk error. I recommend that you do this immediately, once you are able to make a good backup of your important files.
    Scott

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