For creators of HTML and MIME messages, here are some suggestions

• Know how your attachments are going to be sent. Bear in mind that what's reasonable for another recipient isn't necessarily reasonable for the rest of the world. For example, sending a Microsoft Word document as an attachment might not work out as well as you think it should.

If options are available for turning off attachments, do so, except perhaps for specific correspondents known to have the ability to view the attachments. This is particularly relevant to users of mail systems in Microsoft operating environments.
Microsoft TNEF data (WINMAIL.DAT attachments), for example, which was very common during 1996 and 1997, is not something that most Internet correspondents can presently handle. In addition to attachments, TNEF data may include links to OLE objects, fonts, colors, and other information that doesn't have the same form or meaning outside a Microsoft operating environment .

Turning Off HTML or MIME
There are now a variety of HTML/MIME programs, including but not limited to:

AOL

• AOL 5.0 and earlier
• AOL 6.0
• AOL 7.0
• AOL 8.0
• AOL 9.0
• AOL 6.0, 7.0, 8.0 Alternate

Apple

• Mac OS X Mail

Eudora

• Eudora Light v3.0.5 and earlier
• Eudora Light v3.0.6
• Eudora Pro v4.0.2 and earlier
• Eudora Pro v4.2 and later
• Eudora v5.0

Microsoft

• Entourage 2001 (Macintosh)
• Entourage X (Macintosh)
• Entourage 2004 (Macintosh)
• Hotmail
• MS Internet Explorer 4.0, 5.0, 5.50 and 6.0
• MSN Explorer 6.0
• MSN Explorer 7.0
• MSN 8.0
• Outlook Express 4.0
• Outlook Express 5.0, 5.50 and 6.00
• Outlook 97 (without Service Release 1 SR1)
• Outlook 97 (with Service Release 1 SR1)
• Outlook 98 (Work group version)
• Outlook 98 (Internet version)
• Outlook 2000
• Outlook 2002
• Outlook 2003
• Outlook 2007
• MS Exchange 4.0 and other MS problems
• WINMAIL.DAT (TNEF) attachments
• Equal signs at end of lines
• ISO 8859-1 or other character sets
• MS Exchange Server 5.0

Mozilla/Netscape

• Mozilla 1.1
• Mozilla Thunderbird 0.5
• Netscape Communicator 3.xx
• Netscape Communicator 4.0x - 4.4x
• Netscape Communicator 4.5, 4.6, 4.7
• Netscape Communicator 6.0 - 6.1
• Netscape Communicator 6.2
• Netscape Communicator 7.0 (PR1 & Final)
• Netscape Communicator 7.1

Miscellaneous

• CompuServe 2, 3 and 4
• CompuServe 2000
• Earthlink 5.0
• Juno v5.0
• Lotus Notes R5
• Novell Groupwise
• WebTV
• Yahoo Mail

*This page was made possible with contributions directly from the various resources of email program manuals and http://www.expita.com and other on-line resources.