Wehn you attach a file to an email generated by the Mozilla mail client, the Content-Disposition is set to 'inline'. It should be set to 'attachment'. This can confuse some mail servers and clients. I have included the header of a test message to give you an example... From: Ian Elverson <email@example.com> User-Agent: Mozilla/5.0 (Windows; U; WinNT4.0; en-US; rv:1.0rc1) Gecko/20020417 X-Accept-Language: en-us, en MIME-Version: 1.0 To: firstname.lastname@example.org Subject: inline test Content-Type: multipart/mixed; boundary="------------060101070900000608010102" This is a multi-part message in MIME format. --------------060101070900000608010102 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit hi --------------060101070900000608010102 Content-Type: application/x-msexcel; name="ats1.xls" Content-Transfer-Encoding: base64 Content-Disposition: inline; filename="ats1.xls" This problem is fixed in Netscape 6.x, but it exists in 4.7x, so I would assume the Mozilla codebase came from Netscape 4.x.
Duplicate of "Some attachments get Content-Disposition: inline (incorrect)" *** This bug has been marked as a duplicate of 65794 ***