Attachments sent to an Internet address from Macintosh client split or duplicate

Technote (FAQ)


You have configured your environment to avoid sending BinHex attachments. However, since that time, you have the following issues sending mail to an Internet address from a Macintosh client:

  • At the client level, one attachment is split into two: a resource and a data fork. You can see this in the sent view of the sender and in the addressee's mail.
  • When the Domino server sends Internet mail (created by a Macintosh user) through SMTP, the attachment(s) can be duplicated, so that the addressee receives two copies of each file from the split attachment. This can lead to lost e-mail messages due to enlarged message size and mail quota issues.


This issue was reported to Quality Engineering as SPR# DJOE6BSGYG and was addressed in 6.5.5 and 7.0.2 with a new option to send "Windows-friendly" attachments.

Excerpt from the Lotus Notes and Domino Releases 6.5.5 and 7.0.2 MR fix lists (available at


  • SPR# DJOE6BSGYG - Added the option to send "Windows-friendly" attachments, which do not include the resource fork. This prevents the server from sending two MIME blocks for each Mac file, which could confuse mail clients (like hotmail).

This feature is not available prior to 6.5.5. Refer to the Upgrade Central site for details on upgrading Notes/Domino.

To enable this feature:
You can activate this feature by adding the new Notes Preferences (the Macintosh equivalent of notes.ini) parameter "pcfriendly_attachments=1" which will send "Windows-friendly" attachments. Once this parameter is added, Windows-friendly attachments will be sent by default (including through drag-and-drop). Adding this parameter is different in 6.x and 7.x.

In 7.x:
  1. Open the Notes Preferences file in TextEdit, or any other text editor.
  2. Add the parameter to the end of the file, as you would on a Win32 system.
  3. Be sure to leave a blank line at the end of the text file.

In 6.x:
  1. Use the Notes Preferences Editor to edit the Notes Preferences file.
  2. Choose Item -> Add.
  3. "Name:" should be "pcfriendly_attachments".
  4. "Value:" should be "1".

See the document below for more information on the Notes Preference file:
See the document below for more information on acquiring and working with the Notes Preferences Editor:

You can add the parameter dynamically in 6.x by doing the following:
  1. Create a new memo and click in the body field.
  2. Choose File -> Attach.
  3. Check the box "Create Windows-friendly attachment".
  4. Choose a file to attach, and click "Create".

This adds the setting to the Notes Preferences file and will behave exactly as if you had added the parameter manually. You can discard the memo that results from this process. This process does not add the Notes Preferences parameter in 7.x.

Related information

Notes Macintosh client sends out attachments BinHex
Notes preference editor for Notes 6.x and Mac OS X
Where is the Notes.ini file located on the Macintosh?

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Document information

More support for:

Lotus End of Support Products
Lotus Notes

Software version:

6.5.5, 7.0

Operating system(s):

Mac OS X

Reference #:


Modified date:


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