[ ] -> 8-bit characters in the message body are sent "as is" (converted to either the ISO-8859-1 or the ISO-8859-15 character set). [x] -> OpenXP uses a special encoding called "quoted printable" to encode umlauts and other 8-bit characters so that all systems in the network should be able to transport them correctly. Normally, this option should be left disabled, unless transport problems are being experienced due to 8-bit characters in your messages. With this option enabled, OpenXP translates INCOMING "quoted printable" messages correctly!