Wondering if anyone can help.

I have recently upgrades a BM3.6 server to 3.7 at a location with an
internal Groupwise server. I have implemented the mail proxy, the 3
access
rules to prevent Mail relaying, the proxy.cfg file entries and packetfilters. Since the install about 3 weeks ago I have been having the
following problem.

This company has many remote users who collect their mail through pop
and
the BM mail proxy but who are using their own ISP's mail servers to
send
their outgoing mail. They are listing their sending (from) address as
the
domain of the company not their ISP. Since the upgrade to BM3.7 these
users
can continue to send mail anywhere except when they try to send to
their
own domain. It appears as though the BM is seeing a message destined
for
domain xyz.com coming from xyz.com and isn't proxying it through to
groupwise. All other mail seems to be coming and going properly.

Has anyone encountered this problem and know of a solution?

Thanks
John