the answer is obviously to use a proxy on your laptop even when at home, that way you always look like you're sending them from the same place!
Lots of free proxies out there, and with ProxySwitch + Chrome, you can automatically have it activate proxy when you access
www.gmail.com so you don't have to mess around with it.
Plus free proxies are usually slow so you would only want to use it when you are sending email
elmetal