local and internet mail delivery

[Lars Maschke]

hello !

i need help for the horde imp 2.2.4 and sendmail. i would like to deliver
e-mails locally like hurra@local.int and in the internet like
hurra@internet.com. when i send a message local to an user everythings ok
with the from header. i can reply. but when i send a message to my internet
e-mail-account i have only one global e-mail myemail@internet.com which
every user who sends an email to the internet must have in the from-header.
How can i do this ?

At the moment i get the local domain hurra@local.int which i can't reply.
Who can i fix this problem ? Thanks
Lars