from-address getting clipped

[Mika]

Jop,

I have a strange problem with HORDE 1.2.5/IMP 2.2.5. If I have a username
with number(s) in it (e.g. tpa34ha) all messages he/she sends will
have the from: address cut from the first number, e.g. messages from
user tpa34ha will have from: of tpa@domain.com.

I am propably simply missing something but can't figure out what it
is. Is my c-client somehow broken? I checked and compose.php3 has
from-field set as it should be when composing the message, so
something happens after clicking send. Option "user_change_from" has
no effect.

Thanks for any info.


.Mika