Sorry if this is not the correct place to ask. My domian that used to register for my adsense account going to expired tomorrow, is it a must to have it alive or it is alright to let it expired while using the codes in other domains?
There should be no problem at all. But If you have (for example) that domain still re-directing to your current domain, and you have any old links (to the old domain) it might be worth while to re-new the domain, just so that you don't lose any clicks from those old links...
there is no connection with the domain and adsense,but if you used an email address from that domain,you'll want to change your email address in your adsense account.
If you don't want to renew your domain anymore..that's not a problem... mine have been expired for 4 years already..
i think you wont get any problems because i get permission from google for my blog but since then i never look to it, even i donot know that blog is running or what. you can use it's my oppinion