[Exim] aliases with hyphens fail

    I am using Exim with multiple domains. I am trying to foward mail
for a few addresses to another system. This works for all aliases
except those with hyphens. On the aliases with hyphens, everything
after hyphen gets stripped:

for aliases in the domain abc.tld...

jeff:        jeff@???

works fine, but

don-projects:    don-projects@???

doesn't because exim strips off the -projects part and delivers to
don@???.

    I am clueless as to why this is happening.

    Any clues would be much appreciated. :)

Brian