What is the off-topic marker?
An off-topic marker is the text “OT:” (without the quotes) inserted into the subject header of a message. This indicates that the message is off-topic. The off-topic marker makes it easy for people to avoid off-topic discusssions if they so choose, by using a filter in their e-mail client. If there is an “Re:” and/or “Fwd:” in the subject line, simply replace “Re:” and/or “Fwd:” with “OT:” to prevent subject headers from becoming long and redundant (such as “Re: OT: Re: Miles”).