No, I checked my logs and it was definitely Rogers. Sendmail 
helpfully flagged suspected relay messages to its log.

On Mon, 10 Apr 2000, Greg A. Woods wrote:
> Date: Mon, 10 Apr 2000 22:58:35 -0400 (EDT)
> From: Greg A. Woods <woods@weird.com>
> Reply-To: NetBSD/i386 Discussion List <port-i386@netbsd.org>
> To: NetBSD/i386 Discussion List <port-i386@netbsd.org>
> Subject: Re: NetBSD and routing
> 
> [ On Sunday, April 9, 2000 at 13:40:42 (-0700), Brian de Alwis wrote: ]
> > Subject: Re: NetBSD and routing
> >
> > Be careful with this: Rogers@Home does check for servers periodically.
> > I was burned for running an older sendmail which allowed resending,
> > and was cut-off until I stopped all and any servers. So I instead
> > blocked all packets coming from Rogers. Same effect from their
> > perspective :-)
> 
> It probably wasn't Rogers that did the checking in that case but rather
> someone either testing for open relays (eg. ORBS), or perhaps even
> someone actually routing spam through your server (did you check your
> logs to see who found it first?).  In either case the result was
> probably a complaint to <abuse@home.com> and I hear that eventually they
> will act on at least some complaints....  :-)
> 
>