I know you're probably a spammer and wont see this but for anyone that might actually get suckered in by this i'll point out that this certainly is a waste of money.
You can sync between multiple devices using IMAP instead of POP for your email.
For people wanting to use their own domains you can get this for free by using
Google Apps for your domain (go for the standard edition rather than the pay for premier version). You also get access to a Jabber/XMPP service using your domain (provided you set up the
relevant DNS records), as well as many other Google services. I use this for one of my back-up domains.
For people who aren't comfortable with Google there are other options. For my main domain i use
PolarisMail for my email. 1 mailbox costs $12/year. For XMPP/Jabber and SIP i use
OnSIP. It's not mentioned on the prices page but they have an "á la carte" option that doesn't cost anything if you don't use any additional services. Using this combination means that my email, Jabber and SIP addresses all use the same unified address.