Newbie Question

[Thomas Bulka]

Hi,
as a GnuPG-Newbie I want to ask a very basic general
understanding question.
If I generate a key, is it supposed to work only
with the email-Address I entered during the generation
process?
I mean, can I sign mails sent from another adress with this
key or am I supposed to create another key for every address I use?

Sorry for my English and thank you very much in advance.


Thomas