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Custom headers
-
Install the about:config
extension to be able to access hidden preferences. Open Tools ->
about:config.
-
Type
mail.identity.id
into the Filter field. A list of the
settings for each identity is shown. Click on the first column header to sort
by setting name. The setting names all begin with
mail.identity.idX
, where X is the identity number.
Locate the identity you want to set the header for.
-
Look for a preference named
mail.identity.idX.headers
.
If it already exists, edit
it by double clicking, and add a name for the header you want to add,
separated from the previous value by a comma. For example, if there already
is a value of face
and you want to add an X-Face header, you
might use face,xface
.
If the headers preference does not
exist, right-click in the list and use New -> String to add it, entering
xface
as the value.
-
Right-click in the list and use New -> String to add a new preference that
will store the header value. In this example, it is
mail.identity.idX.header.xface
. Enter the complete header
line, beginning with the header name followed by a colon and a space.