Unknown attachments: tkmimexx, mimexx, attaxxx.dat, bdy.txt

If you have defined file restrictions with the help of iQ.Suite Watchdog, emails will often be blocked which according to the report contain file attachments such as, e.g. tkmime01, mime01, atta1.dat or bdy.txt. Where come these attachments from? How can you permit them?

tkmimexx:

These attachments are being generated in an email by iQ.Suite from embedded elements ("inline"), if they do not have a document name. These can be pictures or texts, e. g. an email body which was sent by the sender as "Inline".

Inline elements are being added as attachment to the email with their document name. In the email header, the field $FILE is generated which is evaluated by Domino and by iQ.Suite for the processing of file attachments. The document name is entered in this field as value. If there is no document name, iQ.Suite will allocate tkmime01, tkmime02, etc. as default name. This procedure is necessary in order to enable iQ.Suite to check embedded documents correctly, as well (virus scan!, file restrictions, etc.).

Please note: the automatic naming will only take place when the grabber processes the email for the first time. Since such an email did not have a $FILE element at the begin of processing, it will of course only be processed by those jobs which are positioned on Basics – dependence of the attachment - "all". Should you have selected "only with attachment" here, this mail will not be processed by the corresponding jobs.

As already mentioned, attachments with this name can be of different kinds. It is therefore important that you check for binary fingerprints and not for name endings such as e.g. *.exe.
If you want to permit emails with file attachments whose body was sent in the "Inline Format", you have to permit ASCII in the file restrictions. For this purpose, you can configure a special fingerprint by copying the original "ASCII" document, renaming it in e. g. "tkmime" and supplementing it as follows. You then define this fingerprint as exception in your file restriction.

Alternatively:

Depending on the sending email client, the set email format, the sending server, the transmitting servers and on the receiving server, the following file attachments can appear irrespective of the iQ.Suite.

mimexxx.txt:

If the body field exceeds 64 KB and thus the maximal field length permitted, the Domino server generates a $FILE entry with this name.

You can find further details here!

attaxxx.dat:

This attachment will be generated if the sender sends an email in the Microsoft-proprietary TNEF format from a Microsoft Outlook client with a file attachment. When leaving the server, (usually a Microsoft Exchange server), the email elements are being transformed into a file attachment by the name of winmail.dat. At the Lotus Notes Client, this attachement is shown as atta001.dat, for example.

You can find further details here!

bdy.txt:

These emails have a special MIME format which sends the body as file attachment by the name of bdy.txt.

You can find further details here!