Attachment Filtering

Its my understanding that attachment filtering was deprecated in Exchange 2013? We were using forefront protection 2010 to strip zip attachments from the e-mails. After migration to Exchange 2013 this functionality doesn't work since you can't install
the Attachment Filter Transport Agents. I'd like to stay away from installing Exchange 2010 edge transport role to remove zip's. Is anyone aware of any third party transport agents to strip attachments? preferably free...

Is there a specific reason why you can install almost all the transport agents on you Mailbox role but you can't install the attachement filter? I just would like to stay away from adding additional hops in my mailflow.
Well, if I had to guess. One reason would be the overhead. Attachment stripping is resource intensive.
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Similar Messages

IronPort Attachment Filtering using Content Filter Dictionaries

Hello,
one of our customers experiences some Problems with filtering attachments based on their file extensions.
What we did: We created a dictionary with extension formats like ".exe" or ".cab"
Based on this dictionary we created a policy, that all Mails are scanned. If an attachment matching this dictionary is in the mail, this attachment will be striped and replaced by a TXT file.
In my tests this worked fine, only files matching are replaced, the others pass. BUT after activating the rule, we had the Problem, that a lot of attachments not having an extension that should be filtered where striped. So ".xls" or ".pdf" where striped too.
Can you help me how to configure it correct? Do we have to change something in the Dictionary? Why is this happening, any explanation?
Thanks a lot for your help in advance and best regards
Michael

Hello,
We are doing something similar, but we are not using a dictionary. We specify the file extension in a content filter action of strip attachment by file info, file name ends with, and we use this regular expression:
(?i)\.bat
(?i) makes it case insensitive, the "\" makes the action search for the special character period (which in regex is a wildcard), and then the file extension.
When you save it, it will look a little off, the GUI adds some regex characters to it. the entry will look something like this on the content filter page:
drop-attachments-by-name("(?i)\\.bat$"
This expression will drop all instances of file extensions that have .bat, which includes all possible combinations. Examples include .BAT, .bat, .bAT, so on and so forth.
Hope this helps =)

How do you filter attachements?

Hello all,
I was hoping to get some feedback how you(your org) deals with attachment filtering. Currently we simply drop messages with things like .exe, .url etc... The problem is users never know they were sent a message. I've though about attachment stripping, but read in a previous thread that doing this essentially bypasses the Outbreak filters. Then if there is an outbreak users get hammered with what looks like spam.
I'm considering sending a bounce to the sender, but then you've got problems with spoofed addresses etc.
So what's the general opinion on the best way to handle filtered attachments? (And please, I don't want to hear it depends on your organization)
Thanks in advance!
-Seth

What I currently do is strip the attachment. If it is a non-business email then the users know our company policy covers this.
For some attachments, like non-business movies, etc., I set a rule to a filter to strip the attachment but let the mail through so the user knows he got an email but he can't watch a 10MB movie of some wedding dance that's been in the news.
Trouble is the first time such an email arrives it's not possible to create a filter on the fly and apply it to that email, only the ones that come after. So the first email is dropped. I've asked for this as a feature request, hopefully it will come sooner or later.
All this said I have custom filters to just drop emails, especially chain mails whenever possible. It does depend on your organization and how much you (the manager) control.
- Richard

Where attachments are filtered?

Hello! I have Exchange organization with edge server in DMZ. Users was complaining about blocking encrypted zip attachments in inbound mail. I disabled attachment filtering agent at edge server and problem seems to be resolved. Then i had decided to check
whether .ps1 and other scripts attachment are still blocked and found that they are. So the question is: what agent, or what else and where blocks scripts in emails?

Yes, even if the Edge server does not block them, Outlook/OWA will simply not open them.
(Moreover, Powershell scripts will not run if you click on them - unlike a .bat or .vbs file - and will not even run at the command line unless you change the execution policy.)
Please mark as helpful if you find my contribution useful or as an answer if it does answer your question. That will encourage me - and others - to take time out to help you.

Exchange Server 2010 strips email attachment

Our MS Exchange 2010 Server is stripping attachments from email. We have applied MS Exchange Service Pack 3 (KB2808208) and Update Rollup 1 for Exchange Server 2010 Service Pack 3 (KB2803727) as recommended by KB2855809, but attachments are still
being stripped. Please advise.

I would start installing latest update rollup (which is UR8) to ensure that all the known bugs are fixed.
Update Rollup 8 for Exchange Server 2010 Service Pack 3 - http://support.microsoft.com/kb/2986475
Does mail have any notification if attachment is stripping? Look for transport rule if you have any that stirps the attachment and look for the
Attachment Filtering as well...
Amit Tank | Exchange - MVP | Blog:
exchangeshare.wordpress.com

ESA Attachment Whitelisting

We have some new ESAVs installed and currently testing some content filtering, we are using version 8.5.5 build 280.
We have a number of other ironport devices installed so I thought I would reference how we have done it in the past with attachment filtering using content filters. We use a whitelist to only allow a very specific set of document types through our gateways, and everything else gets put in a quarantine.
For example: Allowed_Attachment_Filter
If (attachment-filetype != “pdf”) AND (attachment-filetype != “doc”)
quarantine(“Banned Attachments”);
The problem we am having is that the rule is matching emails that contain no attachments which is not the behaviour I expect.
So is this an issue with the version or is this not the way to do a whitelist? As I said, there are already other ironports in production running this config which are apparently working.

I would have to recommend that the filter actually be:
Allowed_Attachment_Filter:
If (attachment-size > 0 ) AND ((attachment-type != "application/pdf" ) AND (attachment-type != "application/doc" )){
quarantine("Banned Attachments");
This way, the filter is scanning for an active attachment w/ "attachment-size" is greater than 0 --- so, this will not catch against the emails w/o attachments...
And then changing to the "attachment-type" is actually reading the attachment as tagged w/ the email...
So... example of blocked...
Fri Jun 27 15:43:51 2014 Info: Start MID 140 ICID 460
Fri Jun 27 15:43:51 2014 Info: MID 140 ICID 460 From: <[email protected]>
Fri Jun 27 15:43:51 2014 Info: MID 140 ICID 460 RID 0 To: <[email protected]>
Fri Jun 27 15:43:51 2014 Info: MID 140 Message-ID '<[email protected]>'
Fri Jun 27 15:43:51 2014 Info: MID 140 Subject 'asdadfskjlasdl;fjk'
Fri Jun 27 15:43:51 2014 Info: MID 140 ready 140282 bytes from <[email protected]>
Fri Jun 27 15:43:51 2014 Info: MID 140 attachment 'SWIFT=20Beta=20Round=201=20Release=20Notes.doc'
Fri Jun 27 15:43:51 2014 Info: MID 140 matched all recipients for per-recipient policy DEFAULT in the inbound table
Fri Jun 27 15:43:52 2014 Info: MID 140 interim verdict using engine: CASE spam negative
Fri Jun 27 15:43:52 2014 Info: MID 140 using engine: CASE spam negative
Fri Jun 27 15:43:52 2014 Info: MID 140 interim AV verdict using Sophos CLEAN
Fri Jun 27 15:43:52 2014 Info: MID 140 antivirus negative
Fri Jun 27 15:43:52 2014 Info: MID 140 quarantined to "Banned Attachments" (message filter:Allowed_Attachment_Filter)
Looking @ MID 140:
From [email protected] Fri Jun 27 15:43:51 2014
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-Anti-Spam-Result: ArcBAJ/IrVOsEAYB/2dsb2JhbAANTZFLnTYBAQEBAQEGmxRxhAodLFw7ETEZrwGHQZZjF4VkjFWBFgEEkg+ITocvkCo
X-IronPort-AV: E=Sophos;i="5.01,562,1400040000";
d="doc'32?scan'32,208,32";a="140"
Received: from unknown (HELO [172.16.6.1]) ([172.16.6.1])
by myesa_2.local with ESMTP; 27 Jun 2014 15:43:51 -0400
From: Robert Sherwin <[email protected]>
Content-Type: multipart/mixed; boundary="Apple-Mail=_17CE8CEE-3CDB-488C-812D-3F701F599050"
Subject: testing w/ attachment
Message-Id: <[email protected]>
Date: Fri, 27 Jun 2014 15:43:59 -0400
To: "Robert Sherwin (robsherw)" <[email protected]>
Mime-Version: 1.0 (Mac OS X Mail 7.3 $1878.2$)
X-Mailer: Apple Mail (2.1878.2)
--Apple-Mail=_17CE8CEE-3CDB-488C-812D-3F701F599050
Content-Disposition: attachment;
filename="SWIFT Beta Round 1 Release Notes.doc"
Content-Type: application/msword;
x-unix-mode=0644;
name="SWIFT Beta Round 1 Release Notes.doc"
Content-Transfer-Encoding: base64
So --- even w/ my attachment ".doc", it was scanned as "msword"... you'll need to pay close attention to the docs that come through, and assure that the content-type is correctly matching... may need to further tweak the filter to work as expected...
I hope this helps!
-Robert
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External isight vs. internal

How different exactly are the built in isight on a macbook and the external isight sold by apple a while back? i have both because i needed a camera for my stopmotions. Like resolution, color. Also, how does the external hold up to todays standards?

Hello Snipereye64
Such a well stated and brief question that requires a big answer!
Technically, I suppose the answer to your question depends on which built-in iSight is in your MacBook.
Early MacBooks had a 640x480 (VGA) resolution USB iSight that is the same resolution as the external (Firewire) iSight is use. Given normal webcam distance from the lens and adequate light (video takes more light that normal room lighting), I think the image quality of that built-in iSight is approximately equal to, but different from, my external iSight's.
External iSight has auto-focus so it can offer better images at widely different distances to the subject. It is also easier to attach filters and accessory lenses, but this difference is not really an image quality difference.
If your only use for iSight is video chat, your image quality question can best be answered by your video chat partner, who is the one who sees the image your iSight sends. Here is a comparison video test I made some time back with a chat partner who has both internal and external iSights.
My chat buddy changed NOTHING between the two pictures except which iSight he was using. I do not see any significant difference in actual image quality between the two. I do see differences in the amount of software image sharpening, contrast, and color balance. These parameters are software-controlled, so different apps might give different results.
If you want to compare the quality of snapshot still images for email or posting on the web, the best way to critically examine image quality is to make a print of the same subject made with both cameras. I have not done this kind of test using my iSight because, although I occasionally make an iSight snapshot to email, I almost always use my 5 and 10MP digital still cameras for images I want to have enough quality to print or post. No webcam offers sufficient image quality for me for prints beyond about 3x4 inches.
You can do your own comparison and judge for yourself with your iSights. Capture an image of your face with both of your iSights. It is best if you do this as near as possible to the same time, same size, and in the same light. Then print both images and look for image quality differences that are important to you Even though you may not use your iSights to make printed images, the prints will more readily reveal any faults in the test images you make.
Current iNtel Macs (other than MacBook Air) that I have checked have a 1280x1024 resolution. This 1.3MP camera has more than 4.25 times as many pixels as the 0.3MP (640x480) cameras. How this additonal resolution is used depends on the software application that is running the camera. When using iChat, I do not notice the resolution difference, but a printed image or one an image made with some other application might give a different answer. iChat's software image sharpening, contrast, and color balance of the 1.3MP iSights seem to be about the same as they were for the earlier built-ins.
Depending on your intended use for your images, you can use "The Test App" from this article to test which built-in iSight you have. However, the best test will likely be how the images made with the software you use looks to you for the purposes you intend.
My old "Rev A" external iSight still works as well as it did new for video chat and an occasional quick video clip for emailing. It is good enough for me.
Please let me know if I missed anything. ;-)
EZ Jim
PowerBook 1.67 GHz w/Mac OS X (10.4.11) G5 DP 1.8 w/Mac OS X (10.5.2) External iSight

Encrypted file deleted from edge servers

when any user try to send encrypted files as attachment from internal to external
edge server stripe the attachment.
and there is no attachment filter entry for encrypted files in the attachmentfilterconfiguration.

Hi,
There are two types of attachment filtering to control attachments that enter or leave organization through an Edge Transport server.
Filtering based on file name or file name extension
Filtering based on file MIME content type
According to your issue, please check your encrypted files name or files name extension is not in the format list of Attachment Filter Entry.
You can use the following command to view a complete list of file name extensions and content types that attachment filtering can detect.
Get-AttachmentFilterEntry | Format-List
Otherwise, we can disable the attachment filtering by following command to take a test.
Disable-TransportAgent "Attachment Filtering Agent"
After you enable or disable attachment filtering, restart the Microsoft Exchange Transport service by running the following command:
Restart-Service MSExchangeTransport
To know more about how to manage attachment filtering on Edge Transport Servers:
http://technet.microsoft.com/en-us/library/aa997139(v=exchg.150).aspx
Best Regards.

TCP Write loosing packages

Dear,
When I use TCP Write in fast succession (immediate one after the other) TCP packages are lost.
When I program 3 time TCP Write just one after the other the 3rd packages is lost.
Doing it in the same way with a timed loop of 1ms it works propperly.
So what is going on in LabVIEW?
Any Ideas?
Kind regards
Martin
Attachments:
TCP.png ‏47 KB

Are you running wireshark on the sender or in the receiver end?
TCP is designed to run un unreliable networks, and packet loss always occurs at some level, at which case the missing packet is retransmitted.
A TCP connection is initiated with a threeway handshake and both sides keep track of every single packet. Packets can arrive out of order, some missing, even some in duplicate, and the receiver will make sense of it, reassemble, and request retransmissions.
Your third message is part of the same TCP connection so it is difficult to image it go missing unless one of the sides resets the connection prematurely.
Kunze wrote:
The receiver is allwas ready since it is a peer to peer with 100Mbit/s
What does network speed have to do with readiness? What program is receiving the packets and who wrote it?
Did you update the network drivers?
Can you attach filtered wireshark traces, one recorded on each side, showing all communication between these two nodes?
LabVIEW Champion . Do more with less code and in less time .

Cannot receive external emails

I have one account on Exchange Server 2013 that only receives internal mail, external mail gets rejected with the following error:
Reporting-MTA: dns;DUB004-OMC1S11.hotmail.com
Received-From-MTA: dns;DUB110-W4
Arrival-Date: Fri, 27 Mar 2015 02:22:32 -0700
Final-Recipient: rfc822;<email>@<Domain>.co.uk
Action: failed
Status: 5.7.1
Diagnostic-Code: smtp;550 5.7.1 Recipient rejected (R4)
The email account appears to have the same settings as the email accounts that accept both internal and external email.

Hello,
Good Day...
Request you to please follow the below steps
5.7.1
A very common Exchange 2010 NDR, the cause is a permissions problem. For some reason the sender is not allowed to email this account.
Perhaps an anonymous user is trying to send mail to a distribution list.
Alternatively, a user may have a manually created email address that does not match a System Policy.
Check SMTP Virtual Server Access Tab. Try checking this box: Allow computers which successfully authenticate to relay.
Check the outgoing SMTP logs.
Check: Mailbox – <Mailboxname> – Properties – Mail Flow Settings – Message delivery restrictions.
Try disabling Windows-Integrated-Security. Instead allow only standard authorization on the SMTP receiver on the Exchange 2010 server.
Check Attachment filtering on the Edge server.
Also you can follow the below steps
Add the user/aliases affected by this to the User List
Found under Management tab > User Management
Change the Unknown Users setting
Found under Management > Inbound Filtering
> Spam Handling Settings > Unknown Users
NOTE: BLOCKED is the recommended option
Cause : When Unknown Users is set to block and the user is not listed in the Control Panel, then email to that user is rejected.
For More Info: http://www.techrid.com/exchange-server-2010/mailflow/exchange-server-mail-flow-troubleshooting-with-list-of-exchange-2010-ndr-codes-2/
Regards,
Praveen
Remember to mark as helpful if you find my contribution useful or as an answer if it does answer your question.That will encourage me - and others - to take time out to help you Check out my latest blog posts @ Techrid.com

2010 - Hide recipient's friendly name in moderated rejection message?

Hi all,
Our organization just went through a bit of a virus scare. In response we implemented a policy where any ZIP attachments are moderated in order to prevent any other infections from being sent to anyone in the organization via email.
My worry is that the rejection message shows the full display name of the original recipient, which reveals more than I'd like to. The last thing I need is to give someone a higher chance of getting their identity stolen.
I'm running Exchange 2010. Is there any way to customize the rejection message or even just to not show the recipients or the full display name?
Thanks in advance.

Hi,
According to your description, we can deploy a transport rule with condition: when any attachment file name contains text patterns, then we can catch messages with attachment file types by adding the file extensions to match in this condition. For example
.EXE , .ZIP. At last set the rule action to bounce the message.
However that this only inspects the attached file name and not the attached file contents to determine the file type. If your goal is to prevent viruses by filtering out specific attachment types, regardless of how the file is actually named, then you may
want to employ the attachment filtering agent in Edge server instead. More details about
Understanding Attachment Filtering, for your reference:
https://technet.microsoft.com/en-us/library/bb124399(v=exchg.141).aspx
Note: the system generates a delivery status notification (DSN) failure message to the sender and we can customize your rejection response.
Best Regards,
Allen Wang

Strip out attachments before forwarding emails

I am looking for a solution to strip out attachments before forwarding emails to a specific domain in exchange 2010 .is there a specific hub transport rule that can fulfill my requirement . Please suggest ?
Aditya Mediratta

Hi,
I double-checked the hub transport rule, it doesn’t have the ability to deal with attachments.
I suggest to use Attachment filtering on Edge Transport servers.
https://technet.microsoft.com/en-us/library/bb124399(v=exchg.150).aspx
Best Regards.

Just got an external isight-

Been trying it out and I was wondering if the image quality is better than the more recent built in cameras on the mac. Its certainly better than the USB cameras that my buddies have.
If I could only figure out version I have....

Hello Zband
... if the image quality is better than ... built in cameras on the mac.
Given normal webcam distance from the lens and adequate light (video takes more light that normal room lighting), I think the image quality is approximately equal.
External iSight has auto-focus so it can offer better images at widely different distances to the subject. It is also easier to attach filters and accessory lenses, but this difference is not really an image quality difference.
If your only use for iSight is video chat, your image quality question can best be answered by your video chat partner, who is the one who sees the image your iSight sends. Here is a comparison video test I made some time back with a chat partner who has both internal and external iSights.
My chat buddy changed NOTHING between the two pictures except which iSight he was using. I see differences in the amount of software image sharpening, contrast, and color balance. However, I do not see any significant difference in image quality between the two.
If you want to compare the quality of snapshot still images for email or posting on the web, the best way to critically examine image quality is to make a print of the same subject made with both cameras. I have not done this kind of test using my iSight because, although I occasionally make an iSight snapshot to email, I almost always use my digital still cameras for images I want to have enough quality to print or post.
Rather than accept my assessment, you can do a comparison and judge for yourself. Capture an image of your face with both your iSight and a different Mac that has a built-in iSight. It is best if you do this as near as possible to the same time, same size, and in the same light. Then print both images and look for image quality differences that are important to you.
If I could only figure out version I have....
Look on your iSight's Packaging. The version/model number is printed on the outside of the box near the serial number.
If you did not get the original packaging with your iSight, look in System Profiler. (System Profiler's model identifier is different from the model number printed on iSight's packaging.) To find your "Model:" information, your iSight must be connected. Launch System Profiler, and click the items shown below to see the info about your iSight:
Your Service Tech can find out, too, but he only needs iSight version information in case he needs parts. However, from a user point of view, all external iSights work alike.
My old Rev A works just as well as exactly like the last ones made. The only iSight model ("version") difference important to users is which mounting hardware was furnished. My Rev A came with adhesive mounts, while Rev B and C came with Magnetic mounts for the aluminum framed Apple Displays. All versions had a reasonably good mount for your PowerBook.
Cheers,
Jim
Mac OS X (10.4.9) G5 DP 1.8 External iSight

Ps CS6 Problem: Transform applied to Smart Object fails to transform an attached Smart Filters Mask

Ps CS6
OSX 10.6.8
Problem: Transform applied to Smart Object fails to transform an attached Smart Filters Mask.
I mean a Transform, including Free Transform, as found in the Edit menu. A simple move by the Move Tool is OK.
A workaround until this bug is squashed is to encapsulate the Smart Object + Smart Filters + Filter Mask inside another Smart Object and transform that.
However, that will not be a satisfactory solution in some cases. If a filter has size parameter(s), e.g. Gaussian Blur radius, a scaling or warping/distorting transform applied after the filter will obviously differ from the filter applied after the transform.
In any case, the workaround is inconvenient to subsequent editing and experimenting with filters and masks.

R_Kelly wrote:
I don't think that's a bug since the implementation seems to be purposely done.
It's been that way since photoshop cs3.
If its been like that since CS3 then I think it's a bug which remains because nobody (or not enough people) has complained before.

Get Attachment name with rules/filters

Hello!
I want to create a rule through the GroupWise API that trashes incoming
mails with certain attachment names.
In the CreateRule-Screen there are tons of "filterable" fields avialable,
both user defined and system internal, one of them is attachments.
However, with the FilterSetText-Token it seems I can only access a few
predefined fields, and the user-defined fields through the
"FieldName"-parameter.
How do I get the other internal fields, like "attachments"?
Martin

Your best bet maybe to create a search folder with the query you want
and then read the resulting query out of the folder.
You will find more details on Filter Expressions in the Object API, the
Token docs seem to be more basic and some what older.
Roger Thomas, Dev SysOp 22
<[email protected]> wrote in message news:%Kmid.1859$[email protected]..
> Hello!
>
> I want to create a rule through the GroupWise API that trashes incoming
> mails with certain attachment names.
>
> In the CreateRule-Screen there are tons of "filterable" fields avialable,
> both user defined and system internal, one of them is attachments.
>
> However, with the FilterSetText-Token it seems I can only access a few
> predefined fields, and the user-defined fields through the
> "FieldName"-parameter.
>
> How do I get the other internal fields, like "attachments"?
>
> Martin

Attachment Filtering

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