(Send)mail aliases

[Ivari Horm]

Sorry, if'm asking the question that is already answered, but I still didn't
get it working.

I use Debian Linux with kernel 2.2.16 with sendmail 8.10.12
I have an horde module 1.2.1, IMP 2.0.11 and PHP3 compiled.


I have to manage the accounts of a hihg-school students.
They all have mail aliases firstname.lastname@domain.com, which gets mapped
(according to the alias file in sendmail) to username@domain.com.

I changed the defaults.php3 file:
user_change_fullname = true
user_change_from = false

But it doesn't work!

When they use some kind of a POP3-based mailer, it works well,
even server's mailx does the job, but when it comes to imp, it still sends
out mail with the source address username@domain.com.

What could be wrong?

(I have encountered this problem with all versions of IMP, not only
this particular one.)