This variable allows you to specify mangling (post processing) of data just before it is sent to the irc server. Usually this is meant to remove special formatting you want to make sure you never “accidentally” inflict on others on irc (such as colors)
You may specify any number of mangling rule levels by separating them with commas, and you can unspecify a mangling rule by prefixing it with a hyphen.
For a list of all mangle types, see the mangle_types page.
The set mangle_outbound variable first appeared in epic4pre1.401.