Does Videotron have a greylist of user IP addresses?

[SOLVED]

Today Videotron technical services told me to power off my modem and let the battery drain down to zero during the next two days. That would force a new IP address to be assigned.

Before doing this, I connected my PC directly to my modem and I noted that a new IP address was assigned and that my emails transmitted in seconds. That told me that my old IP address was at fault.

I decided to un-clip the battery pack on the bottom of my Arris TM822 G modem and unplug the 115 VAC power cord.

Then I powered the modem back on and I noticed that my old IP address was restored. Perhaps if I had left my modem un-powered overnight, I would have been assigned a new IP address the next morning.

I chose a faster method. I went into my D-Link router and I cloned the MAC address of my PC to the MAC address of my router.

After rebooting the router, I have a new IP address and my emails transmit in seconds.

My new IP address is also on a blacklist at SORBS and SPAMHAUS, but not on a grey list of Videotron.

So it is the MAC address of the device connected to the modem that affects the value of the IP address that Videotron assigns.