A blank line without a marker should have appeared, so it was clearly understood that the text on this line was new and not a part of the original message. Other times the blank line without the marker inserted without a problem. In another message, yellow HTML span tags appeared. Sometimes a blank line without a marker could be inserted after a paragraph with the span tag and other times a blank line without a marker could not be inserted. On discussion lists send messages formatted only as text.
Subscribers use a variety of e-mail clients.
The use of text will avoid the difficulties mentioned above. URLs will appear hypertexted so links in messages will be easy to go to. Use the address book to indicate the format preference, HTML or text, for an address entry.