#7 dropped connections

[Anonymous]

I have 1 ISP that is dropping connection and failing to
deliver mail. If I shut Fluffy off, and put the port on the
SMTP back to 25, they work. When Fluffy is on, all I
see from them is the connection getting dropped. The
ISP doesn't seem to think they need to do anything
different. I don't know enough about it to figure the
problem out. Off all the droppped connections, this is
the only legimate server being dropped. What info can I
get you so you can help me? Thanks, Stan