Access Keys:
Skip to content (Access Key - 0)

Q: Why is Exchange creating ATT00001 attachments?

On this page:

Overview

The problem:

  • When I format a message with an in-line attachment, such as a screen shot, followed by more text, everything after the first attachment gets displayed as another attachment.
  • The generated attachment file have names similar to 'ATT00001'

What causes it:

  • This happens if you tried to send a message that intermingles text sections and attachment sections.
  • This can happen to any messages that pass through MIT's Exchange server
    • MIT currently has Microsoft Exchange server version 2007
  • This is not dependent on the mail program, it can happen with any mail program
    • It is often seen with Apple Mail because of the flexibility Mail gives you in message format

Solution

This happens because Microsoft Exchange Server is reformatting messages sent through it.

The Exchange server insists that message text must always be first and attachments must always be last. As soon as the Exchange software sees one attachment in a message, it stops looking for text, and treats anything else in that message as an attachment. Any remaining text sections are converted into attachment sections, and given fake file names (like "ATT00001.htm").

At this time, there is no way to make the Exchange server stop turning text sections into attachment sections. The only workaround is to include attachments at the end of a message, after text and after any signatures.

Workaround

Apple Mail

  • In Apple Mail, go to the menu Edit > Attachments
    • Make sure the following settings are checked:
      Always Send Windows-Friendly Attachments
      Always Insert Attachments at End of Message
  • Use the menu Mail > Preferences and go to the Composing section
    • Make sure that Message Format is set to "Plain Text"

With these settings, any attachments added with the "Attach" paperclip button will be put at the end of your message, after all message text.

Apple Mail still allows you do drag and drop attachments - if doing this, be sure to drop them at the end of the message. Attachments dropped in the middle of the message will cause any text that follows the attachment to be converted into another attachment.

Other Programs

  • To keep Exchange server happy, make sure that text sections occur before other attachment sections.

For more information

Microsoft has a KB article confirming that this is a problem with Exchange Server 2007 and 2010:
http://support.microsoft.com/kb/969854

Community

Documentation and information provided by the MIT Community


Last Modified:

February 15, 2011

Get Help

Request help
from the Help Desk
Report a security incident
to the Security Team
Labels:
apple-mail apple-mail Delete
exchange exchange Delete
attachment attachment Delete
att00001 att00001 Delete
applemail applemail Delete
att att Delete
htm htm Delete
c-exchange c-exchange Delete
Enter labels to add to this page:
Please wait 
Looking for a label? Just start typing.
Feedback
This product/service is:
Easy to use
Average
Difficult to use

This article is:
Helpful
Inaccurate
Obsolete
Adaptavist Theme Builder (4.2.3) Powered by Atlassian Confluence 3.5.13, the Enterprise Wiki