Changing over from one ISP (internet service provider, such as AT&T or Comcast) to another usually means leaving the vendor's email address behind. And a new vendor's email address domain (such as “@comcast.net” or @att.net) may also be left behind in the future due to yet another ISP change. So go ahead and switch NOW to free Google GMAIL accounts. Your new GMAIL account can be configured to pull in your existing ISP email until such time as that address is no longer valid. http://www.gmail.com
And, GMAIL can be setup to pull in email from multiple email accounts, so it’s the perfect basis to go with, even if in the future you add your own website and email domain name.
So, map out which email addresses you are using now, and plan for ONE conversion, which will last forever.
PS - Did I mention that free GMAIL accounts have excellent virus/spam filtering, and come with almost 8GB of inbox space? That's like over 5,000 floppy disks full of data!