Isso foi o que eu consegui descobrir sobre o assunto. Este tutorial intitulado: MUDANDO O SEU CABEÇALHO NO PINE .
Changing Your From Header On the Fly If you use more than one From header, you will probably want to make the one you use the most frequently your default and then specify your alternate From header on the fly. The two ways to do this are 1) to directly edit your From header when you are composing a message or 2) to set up the alternate From header as part of one of your alternate roles. These are discussed below.
Using the
default-composer-hdrs
VariableTo view your From header -- and possibly edit it -- while you are composing a message, add the hidden feature
allow-changing-from
to your feature list and add From to yourdefault-composer-hdrs
variable. For example, here's what I use for mydefault-composer-hdrs
:default-composer-hdrs=From, Lcc, Attchmnt, Organization, Fcc, Newsgroups, To, Cc, Bcc, Subject
These are the headers that will be displayed when you are composing a message. You can view these, along with other headers, by by typing ^R to view rich headers. You can edit any of these headers while you are composing a message.
Tip
Add each of your alternate From addresses to your address book and then type the address-book nickname for the alternate address that you want to use in your From header. When you press RETURN, TAB, or an arrow key the nickname will be expanded to the full address.
Portanto, com base no acima, parece que você usaria a Ctrl + R ao compor uma mensagem.